i need help to remove this from comp generic downloader.c its in c:\windows\system32\st3.dll.can anyone help the comps running real slow like its laggging or something

hawking123,

C:\WINDOWS\system32\st3.dll is normally associated with TrojanDownloader.Delf

Your best bet is to go to the following forum to obtain assistance:
http://www.bleepingcomputer.com/forums/forum22.html

There, start by viewing the following:
Preparation Guide For Use Before Posting A Hijackthis Log
http://www.bleepingcomputer.com/forums/topic34773.html