Thanks Allan,
Yes l know that (so sorry Allan, that sound really flippant)
I think l've encountered a re-boot once or twice in XP as far as l can recall, but l believe it gave me the option of a restart now or later. Normally it seems to update when l close the computer down.
From the garbled message l got from my friend, it seemed that she was getting reboots lots of times whislt she was doing other things on the system. Can't see that somehow?
I just wondered whether anything was different between XP and Vista