Systemdoctor and Drivecleaner...

I have had trouble with these programs for a while now... and they usually pop up once or twice each time I log in.

I have run Spybot, Adaware, Norton, and Security Task Manager. None of these seems to have found the problem...

When I ran Tweaknow, it found 50 problems and cleared them. Alas, none of them were systemdoctor or drivecleaner.

When I looked these programs up, I learned that they are actually anti spyware programs that use unethical tactics to get people to buy their products.

I downloaded the free version of Xoftspy, and it found things that nothing else would find, but I need to know before I buy it... will xoftspy take care of these programs?

And if it won't, what programs will work?

I don't want to take my computer into the shop, because it's too expensive.

Please help me fight off this seemingly invincible spyware.

Thanks for any help.