I successfully installed Windows 7 Ultimate Upgrade on my Vista Home Premium laptop while connected to my home network and now I'm trying to install another Windows 7 Ultimate Upgrade on my desktop Vista Home Premium computer on my home network. I inserted the Windows 7 disk, went through the installation program updates and when the installation program was running, I left the machine unattended. When I came back to the computer 7 hours later, the screen was very dimly lit with no images like it was asleep, the CPU light was blinking randomly and there seemed to be no other activity. Pressing "escape" and CTRL-ALT-DEL did nothing. The Windows 7 disk is in the disk drive. What should I do now?