Yesterday night I re-formatted my pc (sob... 6 hours starting from scratch
) because I was unable tu install Vista SP1... there were some corrupted sys files.
Now my system il fully patched and at present time noting strange happened
The settings when the issue occurred: Firewall in safe mode and Defense in clean (the same that are currently used).
What was I doing when did not respond any more? Simple... switching from an IE tab to another on an informational online paper... and with 55% free memory !!!
CTRL+ALT+DEL not worked at all, so I cannot tell if something was using the cpu highly... but I suppose not because no heavy processes were executing...
(sorry for my poor english