Have you tried a cleaner?
Ccleaner, Glary Utilities are the ones I have used most often.

here's more w/ ratings/reviews & download info -
http://download.cnet.com/1770-2018_4...tsTile;navForm

Or try Hijack this - it will make a list of what is actually running on your system - then you can look up each thing if you don't recognize it & go from there. you can get it from the cnet link or Google for it.