NVDVD Problems

[RampantAndroid]

When I play a DVD on my computer using NVDVD (old, I know, got it with my 6800 Ultra) I get momentary pauses (for a slit second) where it seems like a frame is frozen, then it doesn't happen for another couple minutes...

I didn't have this before I rebuilt my system a few days ago...any clues?

Win XP Pro SP2
A65 FX-53
7800 GT


Background programs:
Norton Systemworks 05
Microsoft Antispyware (did it before I installed this)
AIM

Thanks!