hello friend , first don't worry about this cookie, these are used for tracking Ur behavior on the net , now come to the point , first try to restore Ur system using msconfig command , and if restore doesn't work , try to uninstall Ur all antivirus/ spyware program and then install a avast (available free for trial mode but full functional) now schedule this for boot time scan , surly this will work for you.
Do you mean clear up unwanted startup in MsConfig or restore using System restore? Agree with caperjack, I've never know that can be done with msconfig...