1.) Click on the Windows Start Button.
2.) Click on Control Panel
4.) Click on Administrative Tools
5.) Double Click on Click on Computer Managment
6.) Click on Disk Managment
7.) At the Bottom of that screen, right click on the drive that you want to assign a letter to, and select Change Drive Letter and Paths..
8.) Click on the Drive that you are assigning in the pop up dialog.
9.) Click Change
10.) In The drop down box that is shown, select the letter that you would like assigned, then Finaly,
11.) Click on okay.
And yes, there is no step 3 (because it was superfluous)
