Went to use the DVD drive on my PC this morning and it wouldn't work.  

Device Manager has the yellow exclamation mark next to the ATAPI DVD DD
2X16X4X16 entry and properties says: "Windows cannot load the device driver
for this hardware. The driver may be corrupted or missing. (Code 39)"

Tried driver uninstall and then hardware detect, and it says it's found the
DVD drive but then it says "a problem occurred during hardware installation"
and it still can't see the driver.

It's been working up until now - no problems.  I suspect a corrupt driver,
but I don't know how to re-install it from the Windows CDROM. (Anyway, I
wouldn't be able to see the CD-ROM anyway!)

BIOS sees the DVD drive OK.

Can somebody suggest something?