Thank you for your replies. I am not sure how to do a memory dump, but if it will help I will try googling for the procedure.. There are a few facts I should probably have outlined about my config: As mentioned in the first post, I have not made any changes to my system in ages - like upgrading Windows, adding devices, installing drivers/programs, adding or removing hardware. The error appears both after a quick restart following hours of gaming and after having been turned off for the entire night - so overheating seems unlikely. Battery level should not be an issure either since I have my laptop on external power at all times. Sadly, there is no file name showing in the Stop-error - only the error code provided above. Microsoft suggest looking at the Event Manager as well, which I did, but it lists no hint of this error whatsoever. One alteration I DID make, however, is to remove the so-called KB917422 security update from Microsoft, since it was for some unknown reason causing my electroning encyclopedia to stop functioning (this is an issue the the publisher of the encyclopedia is now negotiating with Microsoft, since it has happened to all users of this particular encyclopedia). Shortly after having removed this update (perhaps 1 day I think), the Stop-errors began. So I thought to Hell with the encyclopedia and reinstalled the security update from Windows Update, but this did not make the errors go away. Whether or not it was actually triggered by the removal of this update, I don't know. I should add that: The Stop error never appears while I'm in Windows - only upon reboots or when I turn on my laptop. And when I get the error, I can usually just reboot once or twice and then it boots into Windows. I'm at a total loss here.. Thanks for helping out!