I need some spyware, I’m having a lot of problems with popups & slow browsers. HELP!!

I currently use AOL Safety & Security, it tells me everything is fine, but it’s not. Is this common?

Is it OK to run 2 different kinds of security protection including spyware at the same time?

I was infected with a Backdoor.Trojan, i used yahoo spyware to quarantine yet and it still hasnt finished. Can someone please tell me a really reliable spyware and spyware ad removal thats free and downloadable so i can get this spyware off my computer?
—Edit—

Okay i’ve tried the windows defenders thing either its a idiot or its just not working. It scanned only 13k files and says nothings wrong. While Yahoo scanned over 150k files and found something. Any other suggestions and PLEASE write in FULL sentences, dont be ganster –; I cant read it.
–Edit x2–

Er, if i Quarantine the spyware and then permanelty remove the selected item [Yahoo Norton Spyware] does that mean the spyware is gone?