Computer Not Starting Up

Today I did an update on my norton security 2005 and updated my ewido suite. After I updated both of them I restarted my computer in safe mode so that I could run ewido because for some reason I was getting a notification that I had a keylogger on my computer. I kept blocking it but it kept coming back. This is the first time anything like that has ever been on my computer. I put a 56k modem and aol on it because I moved and I dont have cable modem here and thats when I started to have problems with my comp. Well, when my computer went to start back up it froze, so I manually restarted it. When it started back up it came to the screen asking to start up in safe mode, safe mode networking, safe mode command line, last known working conditions, and normal start up. I tried to start in safe but it started loaded everything and froze up while it was doing its check. It did the same thing in all the safe modes. So I tried it in the last known working option and it went to the Windows XP black loading screen and finished loading then turned to an all black page and froze up again. I tried doing it in normal startup mode and it froze up again after the Windows XP loading screen. It froze on the all black screen again. So, now it wont get any further then that screen. I took out the 56k modem and tried and it still didnt work. Everything seems to be running in the computer. Its not hot. I have not downloaded anything on my computer if a few months. I havent even open any attactments in emails in a few months. Oh yeah I cant get a HJT log or anything since it wont start up in any open. I have windows xp pro sp2..