Changing Drive Letters in Microsoft Windows XP

When you add drives to your computer, such as an extra hard drive, a CD drive, or a storage device that corresponds to a drive, Windows automatically assigns letters to the drives. However, this assignment might not suit your system; for example, you might have mapped a network drive to the same letter that Windows assigns to a new drive. When you want to change drive letters, follow these steps:

• Right-click My Computer, and then click Manage.
• Under Computer Management, click Disk Management.
• In the right pane, you’ll see your drives listed. CD-ROM drives are listed at the bottom of the pane.
• Right-click the drive or device you want to change,
• and then click Change Drive Letter and Paths.
• Click Change, click Assign the following drive letter,
• click the drive letter you want to assign, and then click OK.

You will not be able to change the boot or system drive letter in this manner. Many MS-DOS-based and Windows-based programs make references to a specific drive letter (for example, environment variables). If you modify the drive letter, these programs may not function correctly.

HOW TO: Change the System/Boot Drive Letter in Windows
This article is for Windows 2000, but the same concepts apply to Windows XP. I do not offer ANY support for this procedure.  NOTE: Some user's have reported that this has rendered their system unbootable. Others have reported that it works.  If you follow this procedure, you do so at your own risk