oopps I suspect i've just corrupted my operating system(Windows XP Professional).
I was running SPYBOT, which found a nasty little virus called SMITFRAUD...
whilst it was fixing the problem it abended...now it keeps asking for the original XP installation disc.
as soon as I reboot, i think Windows its going to fail to load.... Maybe its a good time to take the plunge and ugrade to Vista...but at £200+ ouch
Oh well for restart and see if it still works!