Hi paws, thanks , yes that seems to explain what was happening, as this only happens when I'm connected to a WiFi transmitter.
In windows, my PC locks up, after about 20 seconds the screen goes black, then 10 seconds later I get the old BSOD.
When the machine restarts I see that screen, when I go into bios it says I have no HD on my laptop.(I can't select it as primary boot device either) So I reboot and select the drive in the boot menu (on my lappy it's the F12 key) I can select the drive from there and it boots ok.
This is strange, It seems somehow after the crash, the machine tries to boot using the WiFi card. Like I said, this only happens when I'm connected to WiFi.
I'm not sure if this is software or hardware related, but your suggestion definitely helps point in the right direction.
My only concern is after the crashes i ran a SMART test, and my 3 week old laptop is displaying errors
Not the end of the world, the reallocation error message is more informative than terminal afaik.
Thanks for your help.