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Re: Changing lisence keys
No, Vista product key is no good for XP, if the last owner of the pc had a genuine copy of either he should have put a sticker on the back of the pc with the product key code on, on the underside of a notebook, if neither, you will have to purchase a new license from microsoft
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Your license is still valid but you have to call Microsoft ( 1-800-805-4440) and provide them your product id so that they can generate the a new windows XP key for you or may be they will offer you Windows 7. Anyhow, you do not have to buy a new Windows XP key.
I think that what's important is license key of your Win XP, the installer for Win XP can be downloaded from any download site now a days. If you have a friend or know someone who has the Win XP installer, you can barrow it from them or have it copied on another disc. Then use the license key that you have from your previous operating system (Win XP).
You must also make sure that the installer that you will be using is the same version that you used to have before installing Win 7. I hope this one helped in a way.
The disc or the case should have the product key if you bought it alone. If you purchased a computer with Windows pre-installed the cd key should be on a sticker on your computer somewhere. If you just downloaded and burned Windows XP Service Pack 2 you could purchase the key from Microsoft online.
make sure you have taken all the backup of your data from your system bcoz xp will not overwrite on vista you need to be format your drive which will erase your data. for installing windowx xp you need win xp cd as well as all the driver for win xp bcoz the driver is diffrent for vista and win xp .
if you have windows xp bootable cd just place in your cd-rom or in dvd rom .and go to bios setup (bios setup is just press the del button from your keyboard or f2 key it is display whrn you start your system )and change the booting sequnce from hdd to cd rom when it will boot from cd one massage will come press any key to continue just press the space bar and follow the setup instruction .
if you need more help let me know