To change the drive letter assignment for a disk or CD-ROM drive
to open the System Properties dialog box.
Click the Device Manager tab.
Click the plus sign next to the type of drive, and then double-click the disk or CD-ROM drive for which you want to change the letter.
Click the Settings tab.
Under Reserved drive letters, change the drive letter assignment.
Notes
You can also open the System Properties dialog box by clicking Start, pointing to Settings, clicking Control Panel, and then double-clicking System.
If the option to change the drive letter assignment is unavailable, you cannot change the drive letter.
This is found in Win 98 SE, help