Remove BlockWatcher (Uninstall Guide)

  • October 30, 2009

BlockWatcher is a rogue anti-spyware program that is promoted through the use of Trojans. These Trojans masquerade as Flash updates or video codecs that are required to watch an online video. Once the Trojan is installed it will download and install BlockWatcher on to your computer. The installer will also create numerous files that will then be detected as malware when BlockWatcher scans your computer. When you try and remove the files it finds in the scan results, BlockWatcher will state that you need to first purchase it before it will remove anything. This is a scam, because the files that are found are harmless and cannot harm your computer. They are only stating they are infection to scare you into purchasing the program.

  • BlockWatcher screen shot
  • Scanning screen
  • Scan results
  • Fake Windows Security Center
  • Fake security warning
  • Internet Explorer Hijack
  • Infiltration alert

The Trojan will also display fake security warnings on your computer. These warnings will state that malware has been detected or that your computer is under attack. The Trojan will also display a fake Windows Security Center that states that you should purchase BlockWatcher to protect your computer. Last, but not least, this infection will also hijack Internet Explorer so that it randomly shows a security warning when browsing the web. The text of the warning is:

Insecure Internet activity. Threat of virus attack!

Due to insecure Internet browsing your PC can easily get infected with viruses, worms and trojans without your knowledge, which can lead to system slowdowns, freezes and crashes. Also insecure Internet activity can result in revealing your personal information.
To get full advanced real-time protection for PC and Internet activity, register BlockWatcher. We recommend you to protect your PC now and continue safe Internet browsing.

Just like the scan results, these warnings are all fake and should be ignored.

If you find that you are infected with BlockWatcher, please do not purchase the program. If you have already purchase it, then please dispute the charges as it is a scam. To remove the BlockWatcher infection, and any related malware, please use the removal guide below.

Self Help Guide

This guide contains advanced information, but has been written in such a way so that anyone can follow it. Please ensure your data is backed up before proceeding.

If you are uncomfortable making changes to your computer or following these steps, do not worry! Instead you can get free one-on-one help by asking in the forums.

To remove BlockWatcher, follow these steps:


This removal guide may appear overwhelming due to the amount of the steps and numerous programs that will be used. It was only written this way to provide clear, detailed, and easy to understand instructions that anyone can use to remove this infection for free. Before using this guide, we suggest that you read it once and download all necessary tools to your desktop. After doing so, please print this page as you may need to close your browser window or reboot your computer.


To terminate any programs that may interfere with the removal process we must first download the Rkill program. Rkill will search your computer for active malware infections and attempt to terminate them so that they wont interfere with the removal process. To do this, please download RKill to your desktop from the following link.


When at the download page, click on the Download Now button labeled iExplore.exe. When you are prompted where to save it, please save it on your desktop.


Once it is downloaded, double-click on the iExplore.exe icon in order to automatically attempt to stop any processes associated with BlockWatcher and other malware. Please be patient while the program looks for various malware programs and ends them. When it has finished, the black window will automatically close and a log file will open. Please review the log file and then close so you can continue with the next step. If you have problems running RKill, you can download the other renamed versions of RKill from the rkill download page. All of the files are renamed copies of RKill, which you can try instead. Please note that the download page will open in a new browser window or tab.

Do not reboot your computer after running RKill as the malware programs will start again.


At this point you should download Malwarebytes Anti-Malware, or MBAM, to scan your computer for any infections, adware, or potentially unwanted programs that may be present. Please download Malwarebytes from the following location and save it to your desktop:

Malwarebytes Anti-Malware

Once downloaded, close all programs and Windows on your computer, including this one.


Double-click on the icon on your desktop named mb3-setup-1878.1878- This will start the installation of MBAM onto your computer.


When the installation begins, keep following the prompts in order to continue with the installation process. Do not make any changes to default settings and when the program has finished installing, make sure you leave Launch Malwarebytes Anti-Malware checked. Then click on the Finish button. If MalwareBytes prompts you to reboot, please do not do so.


MBAM will now start and you will be at the main screen as shown below.

Malwarebytes Anti-Malware

We now need to enable rootkit scanning to detect the largest amount of malware and unwanted programs that is possible with MalwareBytes. To do this, click on the Settings button on the left side of the screen and you will be brought to the general settings section.

Now click on the Protection tab at the top of the screen. You will now be shown the settings MalwareBytes will use when scanning your computer.

Malwarebytes Anti-Malware Detection and Protection Settings Page

At this screen, please enable the Scan for rootkits setting by clicking on the toggle switch so it turns green.


Now that you have enabled rootkit scanning, click on the Scan button to go to the scan screen.

Malwarebytes Anti-Malware Scan Screen

Make sure Threat Scan is selected and then click on the Start Scan button. If there is an update available for Malwarebytes it will automatically download and install it before performing the scan.


MBAM will now start scanning your computer for malware. This process can take quite a while, so we suggest you do something else and periodically check on the status of the scan to see when it is finished.

Malwarebytes Anti-Malware Scanning


When MBAM is finished scanning it will display a screen that displays any malware, adware, or potentially unwanted programs that it has detected. Please note that the items found may be different than what is shown in the image below due to the guide being updated for newer versions of MBAM.

MalwareBytes Scan Results

You should now click on the Remove Selected button to remove all the selected items. MBAM will now delete all of the files and registry keys and add them to the programs quarantine. When removing the files, MBAM may require a reboot in order to remove some of them. If it displays a message stating that it needs to reboot, please allow it to do so. Once your computer has rebooted, and you are logged in, please continue with the rest of the steps.


You can now exit the MBAM program.


Now you should download HitmanPro from the following location and save it to your desktop:


When you visit the above page, please download the version that corresponds to the bit-type of the Windows version you are using.


Once downloaded, double-click on the file named HitmanPro.exe (for 32-bit versions of Windows) or HitmanPro_x64.exe (for 64-bit versions of Windows). When the program starts you will be presented with the start screen as shown below.

HitmanPro Start Screen

Now click on the Next button to continue with the scan process.


You will now be at the HitmanPro setup screen. If you would like to install the 30 day trial for HitmanPro, select the Yes, create a copy of HitmanPro so I can regularly scan this computer (recommended) option. Otherwise, if you just want to scan the computer this one time, please select the No, I only want to perform a one-time scan to check this computer option.

Kickstart Setup Options

Once you have selected one of the options, please click on the Next button.


HitmanPro will now begin to scan your computer for infections, adware, and potentially unwanted programs. When it has finished it will display a list of all the items that Hitman has found as shown in the image below. Please note that the items found may be different than what is shown in the image.

MalwareBytes Scan Results

You should now click on the Next button to have HitmanPro remove the detected items. When it is done you will be shown a Removal Results screen that shows the status of the various programs that were removed. At this screen you should click on the Next button and then if prompted you should click on the Reboot button. If HitmanPro does not prompt you to reboot, please just click on the Close button.

Once your computer has has restarted or you pressed the Close button, you should now be at your Windows desktop.


As many malware and unwanted programs are installed through vulnerabilities found in out-dated and insecure programs, it is strongly suggested that you use Secunia PSI to scan for vulnerable programs on your computer. A tutorial on how to use Secunia PSI to scan for vulnerable programs can be found here:

How to detect vulnerable and out-dated programs using Secunia Personal Software Inspector

Your computer should now be free of the BlockWatcher program. If your current security solution allowed this program on your computer, you may want to consider purchasing the full-featured version of Malwarebytes Anti-Malware to protect against these types of threats in the future.

If you are still having problems with your computer after completing these instructions, then please follow the steps outlined in the topic linked below:

Preparation Guide For Use Before Using Malware Removal Tools and Requesting Help

Are Your Protected?

While Malwarebytes Anti-Malware & HitmanPro will scan and clean a computer for free, the free versions do not offer real-time protection. If you want to be fully protected at all times then it is recommended that you purchase a premium version.


Malwarebytes Anti-Malware

Purchase the full-featured version of Malwarebytes Anti-Malware, which includes real-time protection, scheduled scanning, and website filtering, to protect yourself against these types of threats in the future!



Purchase the full-featured version of HitmanPro, which includes discover viruses, trojans, rootkits, spyware and other malware on up-to-date and fully protected computers using cloud protection and behavioral detections, to protect yourself against these types of threats in the future!

Disclaimer: While we do earn a commission from the sale of the above products, rest assured we only recommend them due to their effectiveness.

View Associated BlockWatcher Files

c:\Documents and Settings\All Users\Desktop\BlockWatcher.lnk c:\Documents and Settings\All Users\Start Menu\Programs\BlockWatcher c:\Documents and Settings\All Users\Start Menu\Programs\BlockWatcher\1 BlockWatcher.lnk c:\Documents and Settings\All Users\Start Menu\Programs\BlockWatcher\2 Homepage.lnk c:\Documents and Settings\All Users\Start Menu\Programs\BlockWatcher\3 Uninstall.lnk %Temp%\yxh5.tmp.exe c:\Program Files\BlockWatcher Software c:\Program Files\BlockWatcher Software\BlockWatcher c:\Program Files\BlockWatcher Software\BlockWatcher\BlockWatcher.exe c:\WINDOWS\10068tro9zd85.exe c:\WINDOWS\10258z9amb5t73a.bin c:\WINDOWS\10518virzs5f9.ocx c:\WINDOWS\system32\19z89s5y663.dll c:\WINDOWS\system32\1a605tzal32359.dll c:\WINDOWS\system32\1aa8tzi952064.cpl

File Location Notes:

%Temp% refers to the Windows Temp folder. By default, this is C:\Windows\Temp for Windows 95/98/ME, C:\DOCUMENTS AND SETTINGS\<Current User>\LOCAL SETTINGS\Temp for Windows 2000/XP, and C:\Users\<Current User>\AppData\Local\Temp in Windows Vista, Windows 7, and Windows 8.

View Associated BlockWatcher Registry Information

HKEY_CURRENT_USER\Software\BlockWatcher HKEY_LOCAL_MACHINE\SOFTWARE\BlockWatcher HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\BlockWatcher HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run "BlockWatcher" HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run "yxh5.tmp.exe"

This is a self-help guide. Use at your own risk. can not be held responsible for problems that may occur by using this information. If you would like help with any of these fixes, you can ask for malware removal assistance in our Virus,Trojan,Spyware, and Malware Removal Logs forum.

If you have any questions about this self-help guide then please post those questions in our Am I infected? What do I do? and someone will help you.


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