I've just had the same problem...........
Got into pprune o.k. then when I selected forums I recieved a similar message to the one Pipster 1 got, something about an invalid page fault and everything locked up. I tried Ctrl,Alt & Delete to clear it but no response, in the end I had to turn the computer off using the on/off switch. When it came back on something strange came on the screen called scandisk to inform me of some errors, I followed its instructions and here I am!
Anybody know what happened?
Seems strange that two of us should experience simillar problems.
A confused Flybywyre