Enter the term Disk Management in the search box next to the Start menu.
Double-click on the top result "Create and Format Disk".
In the Disk Manager window that opens, right-click on the desired drive.
Select Edit disk letters and paths.
In the window that appears, click Edit.
In the window that appears, check the Assign the next letter option.
In the corresponding drop-down list, select the letter that is not already in use.
Click the Ok button.
Right-click on the driver again and select Mark partition as active.
Reboot the system.