no cd/dvd in windows xp

Archived from groups: microsoft.public.windowsxp.hardware (More info?)

i repaired my windows xp os install due to a networking
issue and installed lots of windows update software
withing a day or so of that(last week). i have a cd plus a
dvd drive and both are found in bios - computer will boot
to either device, but windows shows nothing in explorer or
device manager. i do have nero and alcohol 120% installed
and i did not remove either before the repair operation,
but the upper/lower filters fix i found in the knowledge
base does not apply to me since i cannot find either in
the registry key indicated. HELP!!