I am sure u are affected by the variants of Coolwebsearch trojan..

Refer to this link..

http://www.spywareinfo.com/~merijn/cwschronicles.html

It has a complete writeup on the trojan that had infected ur PC..... CWS.Msconfig

Here is link to download msconfig as i guess it is corrupted.....

http://www.spywareinfo.com/~merijn/winfiles.html

Read through chronicle page.. also search for cool web search related contents in AO.. there are plenty of info available on our board......