I have about 4 or 5 trojan viruses that I can't REMOVE which really pisses me off. But the thing is my computer has been running the same and nothing seems wrong with it. And I've had these trojans for a couple of months. I'm trying to remove them.

But the question is could they cause really bad damage like severly slow my computer down or make it crash etc?In short, yes.
GET rid of them as soon as you can before they cause more damage.
They've most likely CAUSED a lot of damage already and you just haven't noticed.What have you run to get rid of them /
List all your protection apps.Been working on it after I got a PM from the OP . . . I think we're in the clear, just waiting to hear back on final results.
Can't answer your question as I don't know what ELSE was used, but I suggested AVG Antivirus Free, AVG Anti-Spyware, Adaware 2007, and Spybot Search & Destroy. The HijackThis log suggests TrojanHunter, AOL Anti-Spyware and SpySubtract were also used, or at least installed. The log was clean as far as I am aware except from a Zango toolbar which I gave instructions as to how to remove, and out of date Java (Java 6 Update 1) which gave instructions to update.
Lots of stuff running in the background though, I suspect that the computer is running very slowly because of this.Topic resolved via private messaging, no more Trojans.As this issue appears to be resolved (according to Calum), I am closing this topic. If you are the original poster and you would like this topic to be re-opened for any reason, PM me or another moderator and it can be arranged.

If you are not the original poster and you require help, please start a New Topic with information about your computer and your problem.