If you do a search on Google for winsys.exe, it brings up several pages saying that it often comes with a "Tanked" virus that is sent via Kazaa. It sounds like your antivirus was removed the infected files but didn't fix any registry settings. Looking at the website that JJH35 gave you, there are probably some registry entries that are trying to make winsys.exe startup every time. Run regedit and kill winsys.exe in the following places.
HKEY_LOCAL_MACHINE\ SOFTWARE\ Microsoft\ Windows\ CurrentVersion\ Run
HKEY_LOCAL_MACHINE\ SOFTWARE\ Microsoft\ Windows\ CurrentVersion\ RunServices
HKEY_CURRENT_USER\ SOFTWARE\ Microsoft\ Windows\ CurrentVersion\ RunOnce
This should hopefully solve your problem.
Originally posted by Lighter Assuming the missing file isn't part of the OS, remove its instance from the registry (I havn't checked to see what that file is). If it's a corrupted or required MS file, run a repair from the XP CD.
Betcha $50 you pulled that worm in through KaZaA.
i fixed that annoying problem at startup.here it is.goto,regedit,
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\Winlogon\shell ,double click on the shell value and replace the text with "Explorer.exe" (without brackets).basically what you are doing is deleting the "C:\WINDOWS\System32\winsys.exe" entry from that part of the key