|I agree with wanderer, but HJT will pinpoint the problem immediately, saving the excess scans. Some of the best scans are in this order:|
1- Ccleaner Slim (no toolbar) will remove all junk files and also use the registry cleaner. That will speed up the scans
2- Spyware Blaster- use that to prevent malware from happening.
3- Spybot S&D- immunize and also do a complete scan
4- Malwarebytes update it and remove all it finds.
If the problem still persists you can download Avast Free and do a bootscan on reboot, moving all it finds to the chest.
If that still doesn't help, you may have to use unhackme (free for 30 days) and remove the left over problems.
All those free progs are found in the link of my signature on one page so you don't have to search for them
EDIT: I actually run hijackthis every once in awhile on my PC's to see if anything out of the ordinary comes up. It's a QUICK check up
Some HELP in posting on Computing.net plus free progs and instructions Cheers