If you have Windows XP, did you patch it up with Service Pack 2?
The latest service pack for Microsoft's Windows XP operating system does a little more then just patch some security holes; With its build-in firewall & other restrictive settings it can cause quite a lot of problems.
I can not get in installed on my A64 box without experiencing one blue screen after the other.
Did SP2 work for you? Or have you not tried it yet?