Did you install burning software like Sonic RecordNow?
If so, I had the same problem on 64-bit windows vista. Had to uninstall
RecordNow, then edit the registry to get rid of the 'lowerfilters' or
something like that.. then reboot.
My DVD drive works terribly in Vista, regardless. When I try to burn from
another computer (Vista 32-bit) then read in Vista 64-bit the computer just
sort of hangs.
I noticed MSDN no longer has 64-bit Vista RTM posted.. Maybe it was
recalled?
-Rob