The "Windows update wizard halts for wrong time?" thread might be a better place for this question. Additionally, that thread has some suggestions you might try out to see if they work around the problem.

EDIT: If the system clock on your Windows computer is correct, and you're still having trouble with this, it may be good for you to add to Bug # 3834. As of right now, Nokia thinks this problem has been fixed, but if it's still popping up, it'd be good for them to know.