This is a long shot but try this,
See if you can start the infected computer up in safe mode.
How to start Windows 95/98/Me in Safe mode
How to start Windows XP in Safe mode
Then see if you can log on and download HiJackThis from http://www.tomcoyote.org/hjt/ and unzip it.
If you are successful then click the HiJackThis.exe.
Click Scan.
When it's done the "Scan" button changes to a "Save Log". Save the log file it creates (it should open in Notepad),
Copy and Paste the results here in your post, so someone can determind what all is running in the background.
Note: Do not attempt to fix anything till told too!
See if you can start the infected computer up in safe mode.
How to start Windows 95/98/Me in Safe mode
How to start Windows XP in Safe mode
Then see if you can log on and download HiJackThis from http://www.tomcoyote.org/hjt/ and unzip it.
If you are successful then click the HiJackThis.exe.
Click Scan.
When it's done the "Scan" button changes to a "Save Log". Save the log file it creates (it should open in Notepad),
Copy and Paste the results here in your post, so someone can determind what all is running in the background.
Note: Do not attempt to fix anything till told too!