Hi Batboy,
I've had a very similar problem recently, but in my case it was my Vista machine that acted up while my XP machine continued to function properly. See my post to the Vista forum (a reply to Doug1234) which I sent today. Reading that you had the same problem with an XP machine is worrying!
If you have resolved your problem, I'd be grateful to hear how you did it.
Cheers,
GardenLibrarian