OK LET ME START WITH THE BASIC PROBLEMS FIRST....
1. Cleaning a Trojan yourself is the worst thing you could ever do, these programs are written by people with a more advance computer skill then yourself. So the programs are designed to hide theirself.
2. Now There is one free virus protection that works really good - AVG -
GRAB IT HERE!! it's free and it works... period.. PERIOD.
3. Biggest problem people have with their computer is not just viruses, but spyware... a Trojan is designed to do one or the other... (take down your system - or install spyware) So chances are if you have a trojan you have spyware. - The problem is they are two different things.
And Spyware is a little bit more of a problem as it can be hard to remove completely Mainly because people don't know they have it, and if your computer is strong enough it can live on your system with out slowing it down too much. -SO WhY IS IT BAD- Because all spyware kills some computer performance.-because it is always running- always using the net, in the background if you are online. And when your not it's still trying to connect.
That's what makes you say dam why is my computer so slow and it was so fast when i first got it. MORE ON SPYWARE LATER! for now use that program (AVG) for the virus. it's a super virus killer.
Remeber Spyware LOVES YOU..