problem with boot scan

I have ran the boot scan in the past with no problems and my local drive scans show no viruses. The last two times I tried to do a boot scan, when I come back to my computer it is in sleep mode. I move my mouse and I hear the computer running, but the screen it black and nothing I do will make it come on. I shut the computer off by hand, waited a few minutes and started it up. I got the screen that says windows encountered a problem and had to shut down. I selected to start windows with last known configuration. Could a virus be making it do this?

I don’t think so…
Are the fans working?
Isn’t there a problem with the monitor drivers?

The report file is created automatically in \Data\Report\aswBoot.txt
Is there any useful info there?