I have a C Drive with Windows XP Home.
I want to add a D drive with Windows XP Professional.

How do I install Windows XP Pro on the D drive and be abel to boot up
From either the C drive or D Drive?

Thanks
Harry Schlegel...

You should be able to go into the setup and select which drive you want to install XP pro on.

Insert the XP Pro CD, and it should go to the setup prompt. Usually it asks to do a few tests on your system, press enter.

When you go into the system, select D: to install this on. I've never tried it with XP Home and XP Pro so I really don't know if it will work. But if you want to find out, just try to install it just like the XP Home. I had done this same thing with XP Pro and 98 SE on the same drive, just partitioned.