Jump to content


Register a free account to unlock additional features at BleepingComputer.com
Welcome to BleepingComputer, a free community where people like yourself come together to discuss and learn how to use their computers. Using the site is easy and fun. As a guest, you can browse and view the various discussions in the forums, but can not create a new topic or reply to an existing one unless you are logged in. Other benefits of registering an account are subscribing to topics and forums, creating a blog, and having no ads shown anywhere on the site.

Click here to Register a free account now! or read our Welcome Guide to learn how to use this site.


Critical 101 Error Fix

  • Please log in to reply
5 replies to this topic

#1 negster22


    Microsoft MVP

  • Malware Response Team
  • 42 posts
  • Local time:03:36 PM

Posted 24 June 2005 - 09:46 AM

I have found a fully automated fix to correct both the Microsoft Windows AntiSpyware and Giant AntiSpyware 'Critical Error 101' which I will share with you at Grinler's request. I have tested it and retested it on my system numerous times.

It consists of a DOS batch which uses the pskill utility by Sysinternals to automate the killing of the process gcasServ.exe for XP home or Windows 2000 users. XP Pro users do not need to download pskill and may use the taskkill utility which comes with the XP Pro Operating system. See *Note below.

XP Pro users - use the line in the batch with taskkill and omit the pskill line in the batch

XP home or Windows 2000 users - use pskill and omit the taskkill line in the batch. You may download pskill from Sysinternals, which operates the same way as taskkill and unzip it to C:\Windows.

1.) Copy the text in the quote box to a notepad text file.
2.) If you have XP Pro, omit the line in bold below from the text file which reads: "pskill gcasServ.exe", and proceed to step 4.
3.) If you have XP Home or Windows 2000, delete the line in bold which reads: "taskkill /F /IM gcasServ.exe" from the text file, and then save the file as in step 4.
4.) Save the file to your desktop as 101fix.bat, NOT 101fix.txt. (To do that, be sure to set the "save as type' to all files)
5. ) To run, Just double-click the 101fix.bat icon on your desktop whenever you get the critical 101 error. If you stiill experience problems, see the **Note below about using MSConfig (second paragraph), and that should fix it.

Net start DcomLaunch
sc config DcomLaunch start= auto
cd \
IF EXIST C:\Program Files\Microsoft Antispyware\ .(
cd C:\Program Files\Microsoft Antispyware\ .
) ELSE (
cd C:\Program Files\GIANT Company Software\GIANT AntiSpyware\.
REM use the following line if you have XP Home or Win 2000 and have downloaded pskill
pskill gcasServ.exe
REM XP Pro users use the following line - no need to download pskill
taskkill /F /IM gcasServ.exe
gcasDTserv.exe -Embedding

*Note - Warning: If you have Panda AV 2005, its real-time protection will erroneously detect pskill as a hacker tool (false positive) and immediately disinfect it. Therefore you should use the manual method of terminating gcasServ.exe in Task Manager in this case, prior to running 101fix.bat.

**Note - Important: In the process of trying to break Microsoft Antispyware/Giant to reproduce and test this error, I once ran into an instance where I still got the critical error 101 despite running 101fix.bat. If that happens, simply do this: Disable gcasServ.exe in MSConfig - selective startup, and then reboot. Then run the fix and you will be back to normal. To disable gcasServ.exe in MSConfig do this: Click Start-->run-->type in msconfig -->OK. Click startup and uncheck the process gcasServ.exe. Then reboot. Run the fix. Once the MS-AS/Giant Bullseye appears in the system tray icon, you make then go back and you can re-enable gcasServ.exe in MSConfig. I know MSConfig is not in Win 2000, so if anyone has that problem, you may may download WinPatrol to manage your startups.

For more info please refer to this post:

Edited by negster22, 27 August 2005 - 07:46 PM.

BC AdBot (Login to Remove)


#2 younglife


  • Members
  • 11 posts
  • Local time:03:36 PM

Posted 05 September 2005 - 07:27 PM

Im sorry for replying ... but.... after running that process it still doesnt do anything....

I dont know why????

please help

I get that some error too...

#3 Grvylady


  • Members
  • 2 posts
  • Local time:04:36 PM

Posted 18 November 2005 - 09:43 PM

I also tried this fix and it is not working for me either. I also unchecked in msconfig, rebooted and reran the .bat file. Any other suggestions?

Thanks for your help.


#4 negster22


    Microsoft MVP

  • Topic Starter

  • Malware Response Team
  • 42 posts
  • Local time:03:36 PM

Posted 19 November 2005 - 09:34 PM

There are various causes for the 101 error. The above solution worked for me. Here is another method that has also worked for some users, that you can try:

First, disable the active protection component of MS AntiSpyware/Giant AntiSpyware if it is active, which it probably isn't the case, if you're getting the error:
1. Right-click the red and yellow bulls-eye icon in the system tray
2. Click on "Security Agents Status".
3. Click on "Disable real-time protection".

and make sure gcasServ.exe and gcasDTServ.exe are not running in Task Manager
1. Hit CTRL-ALT-DEL -> open Task Manager
2. Select gcasServ.exe and/or gcasDTServ.exe
3. Select End Process

To repair:
1. Click -> Start--> Control Panel--> Add or Remove Programs
2. Select and click Microsoft AntiSpyware or Giant AntiSpyware, which ever applies
3. Click Change
4. Click Next, and then click Update.

If that did not work, try a repair install:
1. Click -> Start--> Control Panel--> Add or Remove Programs
2. Select and click Microsoft AntiSpyware or Giant AntiSpyware, which ever applies
3. Click "Click here for Support Information".
4. Click "Repair" to do a repair install

More options here:

Edited by negster22, 19 November 2005 - 09:56 PM.

#5 selin


  • Members
  • 1 posts
  • Local time:03:36 PM

Posted 02 August 2006 - 04:54 AM


#6 aleeper


  • Members
  • 1 posts
  • Local time:03:36 PM

Posted 04 June 2009 - 12:46 AM

Thanks for your help. it is great.

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users