Did the red screen show a stop code? If you did, then just google this and see what it comes up with.
The dump should be located in the root directory in a folder called Minidump.. However, it might not be swiched on..
Check the following anyway:
Control Panel>System>Advanced tab>Startup and Recovery
Under the section of System failure, Untick the "Automatically Restart"..
Tick the "Write an event to the system log"
Make sure you have Small memory dump" selected and you have the directory %SystemRoot%\Minidump"
This is XP but i don't think it's much different.
Next time you get the crash, check the event view for errors and google the respective code.
Then check the dump for any clues.