hiya buddy read this see if any good.
Downgrade Without Reformatting
Obviously, the most convenient way to downgrade is to do so without reformatting. In order to do that, you need to have a real retail CD of Windows XP. If all you have is a recovery disk that came with your computer, you’re not going to be able to do it this way. You will need to reformat.
To downgrade, use the following as a guide:
Do a full backup of your current, Vista system. If something happens, you can always revert to the backup.
Boot your computer off the Windows XP disc. Just pop the CD into the CD-ROM and reboot. If, for some reason, your computer boots without looking for the CD drive, you need to go into your system BIOS and change the boot order so that it checks for the CD drive during the boot process.
When the computer asks to press the space bar to boot from the CD, do so.
When Windows XP Setup starts up, press “R” to enter the recovery.
If it asks you to choose a Windows installation, press a number and hit Enter. The likely number will be 1.
If you get asked for an Administrator password, enter when asked. If you do not know it, you will need to abort and go back into Windows Vista to get your password.
At the command prompt, we’re going to use the “fixboot” command. We’ll use the following commands in sequence to prep for XP:
fixboot
fixmbr
cd \
ren windows winvista
exit
When done, reboot the machine again using your Windows XP CD. This time, you can proceed normally with a normal XP setup.
When setup is complete, what you’re going to have is a separate installation of Windows XP. You’re still going to need to re-install your applications and manually move all your data. You will see Vista’s documents on the hard drive. Just move them over to the location you want them to be.
As you can see, there is still work involved with this method. There is no way to downgrade to XP and not have to re-install your applications. The only way to pull that off is if you originally upgraded from XP and you had Windows save a restore point before upgrading to Vista. In that instance, you have something to fall back to.