What program is causing the popup?
If it is not being produced by an ap that has an icon in the tray it might just be Windows Messenger spam.
Other than the popups is your computer acting strangely in any other way - IE blue stop screens, freezing, running very slowly, rebooting by itself, etc?
The first thing to do may be to stop Messenger Service from running, which will cause no harm if this isn't Messenger spam anyway. (this has nothing to do with any of the web instant messenger aps).
Messenger (not to be confused with MSN Messenger, AOL IM or any other internet messenger) was originally created for system administrators and users to communicate with other users on large networks.
Spammers have figured out how to send spam with it taking advantage of exploits on your computer.
What you describes sounds like
Windows Messenger Spam
To block the spam is to turn off Messenger Service.
To do that:
--In Windows XP, click Start>>Control Panel
--In Windows 2000, click Start>>Settings>>Control Panel
In both versions:
--Double click Administrative Tools
--Double click Services
--Double click Messenger
--Under Service Status, click Stop
--In the box next to Startup Type, select Disabled
Alternatively, you can download a small program that will disable Messenger Service called “Shoot The Messenger” which is available athttp://www.grc.com/freepopular.htm
Download and run “Shoot The Messenger”
It would also be a good idea to back-up all important data if you can.
Next, run both Adaware and Spybot Search and Destroy from safe mode, updating each program before you scan and allowing both to fix what they find.
*AdAware SE: http://www.majorgeeks.com/download506.html
*Spybot S&D: http://www.safer-networking.org/en/index.html
Following that that I suggest you post a “HijackThis” log for expert assistance.
Read the pinned post in our “HijackThis” forum,
here http://www.bleepingcomputer.com/forums/t/34773/preparation-guide-for-use-before-using-malware-removal-tools-and-requesting-help/ Carefully read and follow all directions explicitly.
Following instructions create a HJT log, and POST THE HJT LOG YOU CREATED IN OUR HJT FORUM – not in this forum
, at this link
Include the specs for your computer (ie, processor, amount of RAM, brand or motherboard, etc, and briefly describe the problem you are experiencing.)Unless you are expert at editing the registry, Do not use the Hijack This program to try to fix anything by yourself as even what may seem to be a small mistake can render your operating system inoperable.
Some files when in one folder may be fine while in another may be malware.
A member of our HJT Team will analyze your log, make recommendations and offer assistance.
It may take a period of time to get a response to the log you posted because the members of our HJT Team are kept very busy. Please
be patient as this team is manned by volunteers. They will help you in order received as soon as possible.NOTE
Once you have posted your HJT log, please DO NOT make any additional posts in the HJT forum thread you created until you get a response from a member of our HJT expert team, and do not make any changes to your system (changes, including any attempted repairs, will make it different than displayed in the log you posted and therefore make your log inaccurate).
The first criteria they have when looking for logs that need replies are posts showing 0 replies
. If you make an additional post, it will show as having 1 reply
A team member, looking for a new log to work on might well assume another HJT Team member is already assisting you and might not open the thread to respond.
So, make your post and wait for a response from a team member.