Blue screen on vista - constant restarting

Hi all. We're having an issue on my sister's laptop. This has happened before, but I could fix either by system restore or another method I don't remember. This time I press F8 to get the option: Repair Windows, but on clicking on System Restore afterwards, nothing happens. It won't let me get into the process at all.

I captured a screenshot of the blue screen. I apologize for not being able to follow your steps for making a certain file log, because even when on Safe Mode, the blue screen appears and I can't get into Windows.



I'd appreciate your help.
Thank you.

Start out with this free diagnostic: Hard Drive Diagnostic Procedure

If that doesn't find a problem, then try Startup Repair at least 3 times: http://www.vistax64.com/tutorials/91467-startup-repair.html