If you would like, post a HijackThis log here.
Download Hijack This. Unzip to a convenient permanent folder, double click HijackThis.exe, and hit "Scan".
When the scan is finished, the "Scan" button will change into a "Save Log" button.
Press that, save the log, Ctrl-A to Select All, and copy its contents here.
Most of what it lists will be harmless or even essential, don't fix anything yet.