Please re-enable anything in msconfig that is disabled and ok out of msconfig. Rescan with hijackthis and post that log please. Do not reboot.

Go here and download then run Silent Runners.vbs. Right click on the download link and select Save Target As. Save it to the desktop or to a folder in a permanent directory. It generates a log which will be created in the same folder you are running it from. Please post the information back in this thread.
If you have a script blocking program, please allow the file to run. It is not malicious.