Only thing to do is get a geek to lay hands on it. You can't download the tools to get rid of it. It won't let you. I've seen the one you have before (on a neighbor's computer).
I'm not a windoze expert, so I can't help remotely.
Getting linux can stop a lot of what you are experiencing.
/johnny
This thing will let me post ...then it will deny me ....
I found it ...its called FakeAlert-XP Security Center Trojan......I agree this will need a geek.