ok please tell exacly what is going on here, my best guess is that you started an in-place upgrade on the system. ie put in the cd and told to upgrade. then it restarted and went through text mode setup just fine. but now no cd rom drive, or getting a missing NT5inf.cat
well if you would do a quick look at the online microsoft KB you would find the answer, but here it is IF this is your problem.
when you get the missing nt5inf.cat error press shift + F10 -- your at a command prompt %systemroot%system32 good
cd drivers
ren cdudf.sys cdudf.sys.old
restart the system
rename the file back when your up in the OS,
PS adaptec easy cd creator will cause these types of weird issues all the time, uninststall adaptec and never use it again!