Assuming you meant CD-Rom drives this article may help.

http://support.microsoft.com/default.aspx?scid=kb;[LN];270008

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Regards,

Dave Patrick ....Please no email replies - reply in newsgroup.
Microsoft Certified Professional
Microsoft MVP [Windows]
http://www.microsoft.com/protect

"maind" wrote:
>I had a question about win 2000 pro dropping recognition of the disc drive.
> I loaded win 2000 pro, updated to SP4 along with all critical updates.
> The
> system had been recognizing the two disc drives installed on the system, I
> loaded numerous software applications using the disc drives then after a
> re-boot, they dropped both disc drives from my computer, although they
> were
> still listed in the device manager as working properly with no problems.
> They were gone from the system. How can I get these drives up and working
> properly again?
> --
> demain