If you want to change the letters assigned to your fixed or removable drives:
1. Right Click on My Computer
2. Select Manage
3. Select Disk Management
For a Fixed Disk:
1. Select it
2. Right click
3. Select Change Drive Letter and Path
4. Click on the Edit button
5. Enter in the letter you want to use
For a Removable Disk:
1. In the lower, right hand panel, right click on the Disk or CD ROM #
2. Select Change Drive Letter and Path
3. Click on the Edit button
4. Enter in the letter you want to use