Thanks for the replies guys, most helpfull.
I've checked the add-on that jigsy posted, but if thats not XP compatible, it could use an update.
Anyway, I've changed the setting that Genius proposed and that seems to work.
On top of it, I'll also activate the timer that Maroon proposed, and see how that works.
Thanks a lot!
On a side note, typical Microsoft to have a time server set as default that's no longer working.