Not really sure what the problem is.
Is the problem that you don't see the DVD drives at all after boot up in Windows Explorer (not Internet Explorer).
Is it that the drives are given the wrong Drive Letters in the BIOS or in Windows Explorer. Any drive except A, B and C can be given whatever drive letter you want in Windows as it can be set in Control Panel/Admin Tools/Computer Management/Disk Management.
If it is thisS problem then have you installed any other drives for example a memory card reader etc.