Hello,

For the first computer, I am sorry to say that it is really hard to find
out the root cause. The incomplete installation might cause some system
files corrupted, though the next installation succeeded. And as he could
not tell when the DVD drive disappeared, it is hard to narrow down the root
cause (might be hardware or software incompatible issue, also might be
corrupted system files).

If you have any other DVD drive, I would suggest replacing the existing one
to see if that can make any difference. If not, you may need to reinstall
the operating system to get the DVD drive back.

For the second computer, that could be an incompatible DVD drive (HCL
issue).

We have some web sites to check this incompatible information (including
hardware and software). Would you please go to the following two web sites
to see if any of them are listed there?

http://www.microsoft.com/windows/com...y/Default.aspx

http://winqual.microsoft.com/hcl/

Sincerely,
George Yin
Microsoft Online Support
Microsoft Global Technical Support Center

Get Secure! - www.microsoft.com/security
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