I've run into this problem before.  I use to encrypt my Temp directories.  While applying various M$ patches, the files became corrupted and/or unreadable.  If this is the case for you, you have to find all of the encrupted files in the $windir and replace them with non-encrypted versions.

Hope that helps!
Julian

-----Original Message-----
From: "Thane Sherrington" <[EMAIL PROTECTED]>
Sent 4/19/2007 2:01:16 PM
To: "The Hardware List" <hardware@hardwaregroup.com>
Subject: X-SPAM Re: [H]DVDRW disappeared from WinXP

At 02:26 PM 19/04/2007, j m g wrote:
>Folks,
>My NEC-3540 has completely disappeared from WinXP SP2. Shows up in
>the bios, I can boot to cd/dvd's - I've even reinstalled WinXP to a
>different directory via cd on the same drive, but on booting to that
>install - still no DVD drive.

It's not these two keys is it?

Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11CE-BFC1-08002BE10318}]
"UpperFilters"=-
"LowerFilters"=-

T

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