Occasional BSOD's, mystery cause

It may not be related to BSOD but you don't seem to have SP1 installed. Run Windows updates till you get that.

Thank you everyone for your help- I haven't followed through with the steps yet (working) but when I do I will inform you of the results.
And Britton30, whatever I do I cannot get SP1 to come up on windows update. And when my brother installed it on his W7 pc, it killed his Internet signal

Thats a good pickup - you should definately install SP1:
https://www.microsoft.com/en-us/down...s.aspx?id=5842

You want to download the file:
windows6.1-KB976932-X64.exe

I hate to bump this topic, but I have updated virtual box the to latest version. I have had no problems since. If I get more BSOD's I will make another topic.
This topic can be closed now :)

Good news mate!
There should be a Solved button available to you, it's a big green one.