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Plug in your flash drive. Go to Control Panel and select System and Security. In the System and Security window, click Administrative Tools>Computer Management>Disk Management (Under Storage). All the drives on your PC will be visible to the right. Right click your flash drive on the list, then select Change Drive and Letter Paths from the pop-up. In the resulting dialog box, click on the your drive and then choose whatever unused letter you want for your flash drive from the drop-down menu. Click OK and you should be all set.