Hi Tea Girl -
Random restarts are always fun (read dfficult) things to troubleshoot.
First thing first is to find out what it's doing. So I've got a pile of questions - answer the ones you can and we'll come to the ones you can't when it comes to it.
When it restarts what does it do exactly? For example, does it close down properly, or does it just click off and beep and start up again?
When did you first notice the problem?
Are you the only person who uses the machine?
How old is the machine (rough guesstimate)?
When was the last time you backed up your important information?
(I got caught out by this last week

) what version of windows is it running?
Those will give me an outline of where the problem is likely to be coming from and where to go next.
If you do lob the machine out of the window, please remember - safety first. So make sure you unplug it. Also - please film it and put it on youtube - us IT folks always like to see a user get their revenge!
Mrs M is doing fine, enjoying her time off work now, as she finished on Friday, thanks for asking.
