I got something, but don't know what.

Hi all,

Last evening, I had a couple of IE browsers open, one on craigslist, and the other at ebay.
I got up to get a glass of water, and when I came back, I had warning boxes all over my screen.
I seem to recall something telling me I was infected with trojans.
Now, I turn the computer on, and it get to where windows is starting, and it reboots. When I try to boot normally, I see a blue screen,with some text on it, for part of a second before the reboot.
I've tried starting in safe mode and it's the same thing, except I don't see the blue screen before it reboots.
What do I need to do to get this fixed? I'm at a real loss here as to what I need to do, so I turned to the experts here.
Thank you so much for you help.

 

Thanks for the help.
It doesn't look like that was the fix though.
I completed the step one, and when the computer rebooted, it was right back in the reboot loop.
Is there anything else I can try?
Thanks again for your help.

 

Thanks for your help.
I'll get that done later today and leave a post on what I find or can figure out.

 

I chose the repair option, but it appears that it did a new install, but I guess not a perfect install.
When I attempt to start IE or Outlook, I get many .dll errors and am not able to get online yet with that computer.
It looks like it also put me back to SP0 with my XP, so I can't get AVG to install.
I had company come over yesterday evening and stay until late today, so I haven't had a chance to work on it some more.
I will see what I can do about the .dll errors and report back here.
Thanks so much for your help.

 

I apologize for not getting back before now.
I checked a little bit ago, and the only restore point I have is from Sat. 08/21/10. That would have been when I reinstalled XP. All of my earlier restore points are gone.
What other things can I try to get this computer back online?
Again, I appreciate all the help I have gotten here.

 

Thank you. I will do that this evening.
Thanks so much for you help with this.