Hey, if it boots into safe mode, I'd recommend booting into there and removing your graphics adapter. Usually the only time a desktop system dies at the logon screen is graphics corruption. You could also try doing regedit from safe mode, then go to HKLM/Software/Microsoft/Windows/Current Version/Run (I think, this is off the top of my head) and rip out everything that starts on boot, starting with the last thing you installed.