Hello: I had a blue screen while using firefox with a couple downloads in progress and my system suddenly was restarted the typical memory dump, so I couldn't see the error codes or description. The next time I restarted, the disk was checked and found errors in the files that were being downloaded. But the system freezed after the disk check finished. After that, every time I try to boot Windows XP, I got a blank screen after the windows logo with the blue progress bar, just at the moment when the login screen should show up. I can't see the mouse pointer, the HD led shows no activity and the system does not respond in any possible way. I tried starting in safe mode, but the problem persist and I can't never reach the login window. I've run many disk analyzers and antivirus from boot cds but found no errors. Maybe this is useful information: my video card was having overheating problems and I had to "underclock" it to avoid random render defects, but besides that, everything was fine. I can confirm that the card hasn't died since I'm working in the same machine from ubuntu. Any help would be hightly appreciated. Thanks.