Excellent advice from everyone...
Please post a burn log or 2 from the "problem" pc...we may spot something.
The default location is:
C:\Documents and Settings\
Administrator Name\My Documents\DVDFab\Log
As others have said, this could be as simple as poorly compatible media/inappropriate burn strategy with this specific burner.
The devil's in the details...
[Edit]
Almost forgot...
"...And shepards we shall be...In Nomine Patri et Fili Spiritu Sancte..."
A truly great flick!