have you done a spyware search?

if no then try this and see if it fixes ... make sure you dont delete something you need though Spybot

That file comes up in a search ,and the other computer is infected with a Peper trojan ,please do the following .
........................................
Get The latest Version of Hijackthis 1.98.2

Download 'Hijack This!'.HERE


Unzip (extract) it to a folder of its own.Like c:\HJT\hijackthis.exe ,

Then Doubleclick HijackThis.exe (in the new folder), and hit "Scan".
When the scan is finished, the "Scan" button will change into a "Save

Log" button.
Press that, then Ctrl-A to Select All, and copy its contents here. for

hijackthis,most of what it lists will be harmless or even essential,

don't fix anything yet.

Reboot and post a new log