Though I should add that depending on your actual Hardware there may not be any XP Drivers available you really should check that out first before starting anything. So basiacly what you are wanting to do is not possible but that in no way implies that you can not Back Load XP provided you have the necessary Items.

You can simply not use a Win 7 Product Key with any form of XP Install Media though. Then wipe the HDD and use the Old Install Media to install XP. Remember to remove the space from between the Domain Name and the. If you have a Old XP Install Disc and Product Key you are quite entitled to install that but as stated above you first need to backup all your Existing Data then Wipe the HDD with a Utility like Boot & Nuke You can not use the Win 7 Product Key with XP as it's just not going to work. With the Windows 7 Release Candidate expiration date is just a few days away, many of Windows 7 RC users are asking a way to downgrade to Windows XP/Vista. Allows you to remove the current Win 7 Pro and install XP any version but you need a XP Install Disc and Product Key.

Downgrade windows 7 to xp