no drive d

If Win98 or below, run FDISK from Startup Disk and choose View for Drive 2. If FDISK can see it but Win can't, try reinstalling the OS.
If Win2000 or above, go into ADMINISTRATIIVE TOOLS, COMPUTER MANAGEMENT, DISK MANAGEMENT. does it show "D" as a healthy partition? If unformatted, you have lost info on "D" and you must repartition the drive again.
If none of the above applies, download the utilites for THAT drive and run diagnostics. the drive might actually be shot.

GOOD LUCK

Is drive d a cd-rom or a hdd?

Make sure the bios sees the drive. And that you get lights from the drive. If you do not get light, then make sure that the power cord has not come loose.

Reinstall the drivers if a cd-rom drive. Otherwise follow answer 1's response if this is a hdd.

You don't give much information (what os, what kind of drive, which channel it is on, etc.). Look in device manager and see if the I.D.E. controllers are present and working properly. If there are problems, remove them and reboot. If missing, re-install.

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