I would tend to agree now that this is a virus/malware problem
svchost.exe and dllhost.exe being involved point to that.
I think you should post a HijackThis log. The experts on the forum there will clean it all up for you
http://www.techsupportforum.com/secu...this-log-help/
Read the Red sticky at the top first
IMPORTANT - Read This Before Posting For Malware Removal Help