I'm almost certain there should be no file on your system called "witbyqxg.dll". Google does not list it so it is most probably malware. Additionally, if you are sure about the spelling, "svhost.exe is" either a worm or a virus since the genuine file with a similar-sounding name is from Microsoft and is spelled svchost.exe. The virus/worm svhost.exe is programmed to use up all your system resources which further confirms that's what you have.
Update your antivirus and scan your system with it to see if it can detect and remove it. If that does not work, I suggest you download and run the latest version of "HijackThis" then post it's results to the malware forum here after first reading the "pinned" posts for guidance.
The malware forum on Geeks To Go is here: http://www.geekstogo...o-Here-f37.html
HijackThis is here: http://www.spywarein...jn/programs.php
Edited by pip22, 10 May 2007 - 02:20 PM.