I think even I faced a similiar problem... My Norton Antivirus was simply unable to reapir the file... Adware was not detecting any foul....

But then somebody from the forum suggested me to download CWShredder

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

Incase your infected PC does not allow to reach to the url try the following link

http://209.133.47.12/~merijn/index.html

http://www.softpedia.com/public/cat/...0-17-150.shtml

I recmmend try running this software before formatting ur PC....

Take Care

Kalp