help!

i got a serious problem, my comp has been slowing down a lot recently and stuff and i happened to see the spy hunter v 1.1.29 available download on the main page of download.com, so i got it, so it scans my computer for parasites/spyware and finds between 50 - 75 different kinds of virus or spyware mostly in the cookies section (and it said serious under the dangerous section)! you have to pay to get the full version which will get rid of these for me.
so the question is, is there any free-ware that can help with this or another program that does a similar thing? i wana fix this poor computer, it's getting worse cos programs now close randomly for no reason :down: such as msn, and pretty much all .exe files i keep getting random '<insert prog> has to close now' messages and all the errors relate to a 'nview.dll'?
i'm like wtf is going on with this? someone please help! this really is driving me crazy!

thankyou, i'll try Spyware Search & Destroy, i have gotten rid of some of it, any idea what 'Onflow', 'Gator', and 'Blnet' are as they seem to consist of most of the problems. i hope to get this sorted soon. also how do i get to the registry in windows? i knew before but cant remember, something was typed in the 'run' command i can't remember, most of them are in the HKEY_CLASSES_ROOT in the registry. how can i get there?

wow! just deleted all forms of cookies from my computer (and temp internet files), now i've gone from 10 pop-ups per min to none