Restore changed cd drive letter

Try this:
Control Panel -> System -> Device Manager
Double click the cd
Properties -> Settings
Reserved Drive Letters Area: Select letter to define first drive to be assigned to device and last letter to be assigned to device. OK
Close System Properties. OK
Restart computer when prompted.

Hope this is of assistance to you.

You well have to manually edit your config.sys and autoexec.bat. To do this first type (at command prompt c:)

edit autoexec.bat

You should see a line in there that looks simular to the following:

C:\WINDOWS\COMMAND\MSCDEX.EXE /D:TEACCDI /M:5
Your autoexec file wont look excaltly like this but, the important part is the /D: This determines what the drive letter is. What comes after depends on what kind of cdrom drive you have. So now you can replace the D: with Y: The only thing you should change is the letter itself. Save your changes and exit back to the command prompt.

Next you have to change your config.sys. At command prompt type:

edit config.sys

You should see a line that looks similar to this:

DEVICE=C:\TEAC\TEAC_CDI.SYS /D:TEAC-CDI

Again, all you should change is the letter D: to read Y: After you do this, save changes, exit back to command prompt and reboot your machine. Changes well take place after reboot.

Good Luck!!