Hi! Started using this on my wifes' computer

(Windows XP Media Center Edition Version 2002 Service Pack 3 on a Compaq Presario AMD Athlon 64 Processor 3800+ 966MHz 1.93GB RAM )

recently and I've noticed that only the "Non-Service" version (1.6.1.14) of it will work - when I try to use the other (1.6.0.0), it just gives me a message that it can't start the service.

Norton 360 is the A/V and firewall on that computer and its' wirelessly connected to my router, if that makes any difference.

Is this normal? Pete