Click on Start and then Control Panel.
Click on the Performance and Maintenance link.
In the Performance and Maintenance window, click on the Administrative Tools link located under the or pick a Control Panel icon heading near the bottom of the window.
With Administrative Tools now open, double-click on Computer Management.
When Computer Management opens, click on Disk Management on the left.
On the right-hand side of the screen, locate and right-click on the drive that you wish to change the drive letter of and choose Change Drive Letter and Paths....
In the Change Drive Letter and Paths window, click on the Change... button.
The Change Drive Letter or Path dialog box will appear. Choose the drive letter you wish to assign to this partition.
Click OK.
The Confirm window that appears advises you that "Changing the drive letter of a volume might cause programs to no longer run. Are you sure you want to change this drive letter?".
If you're sure you want to make this change, click Yes.
Depending on the speed of your PC, the change should be nearly instant.
The driver letter change in Windows XP is complete!
You can now close any open windows.
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