Check http://support.microsoft.com/default.aspx?scid=kb;en-us;307844&sd=tech

>I need to know how to change the drive letter of the primary boot drive.
>Using WinXP Pro.
>
>The problem is this. The hard drive crashed. When replaced with a new drive,
>it is showing up as drive E:.
>
>The 3" drive is C:, the CD is D:, and the Hard Drive comes in as E:.
>
>I'v tried removing the CMOS battery, and all drives, and rebooting, no
>help.
>
>The Change Drive Letter dialog won't let me change it because it's the
>boot drive.
>
>Anyone know how to solve this?