Demo problem

Remove Vista, as an upgrade of Windows XP

In this case you had Windows XP installed and upgraded it to Windows Vista. Now you want your own Windows XP back. Unfortunately it's not possible to downgrade Vista to XP. Therefore you'll need to remove Vista, format your hard drive, and reinstall XP from scratch. Don't forget to make a backup as there are some risks with removing Vista!
This is what you need:
- Windows XP installation CD
- MS Dos environment boot disk (more info)
This is what you should do:
1. Start your computer with the Windows XP installation CD in your CDROM drive (note: you may have to change your BIOS settings to give priority to loading your CDROM drive instead of your hard drive!)
2. In the setup type R to repair an existing installation
3. Type fixboot C:\ (where C:\ is your Vista root, replace C with any other letter if applicable)
4. Type fixmbr C:\
5. Type EXIT
6. Then close the Windows XP setup and restart your computer with the bootable floppy or CD
7. At the command prompt type format C:\ (note: all data on C:\ will be removed, so make sure you've made a backup before doing this!)
8. Now restart your computer with the Windows XP installing CD in your CDROM drive
9. Install Windows XP as usual This should remove your Windows Vista installation and make XP the default operating system

Contrary to what someone said you can't really use a "key finder" and activate it with that key because it is already activated with that key on someone elses computer. Generating a key where you can use one OS on more than one computer IS illegal. If you did a Vista upgrade to XP and saved your XP files(should show up as "Windows old" in your Windows folder) you may be able to simply uninstall the Vista upgrade. Chances are that you will have to reformat and reinstall XP, something you should have known before you put someone else's OS in. Microsoft operating systems cost those of us who pay for them 20% more because of people who pirate it!!! Bottom line is, if you don't pay for it, it isn't legal.

If you have installed vista as a multiboot sytem, then you can do the below: Otherwise you have to do as tom19511 said:

Uninstall Windows Vista on a multiboot system
Applies to all editions of Windows Vista.

You cannot uninstall Windows Vista. However, you can change the code that starts the operating system (often called the master boot code), and then remove Windows Vista from your multiboot system and return to Windows XP or Windows 2000. You will need your Windows Vista installation disc for this procedure.

Before you begin, back up your programs, files, and settings. Removing Windows Vista is an advanced procedure that could result in losing information stored on your computer. For information about backing up data, search Help and Support for "back up."

1) Insert the Windows Vista installation disc.
2) Click the Start button , click All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator. If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
3) Type [DVD drive letter]:\boot\bootsect.exe /nt52 ALL /force and then press ENTER.
For example, if the DVD drive letter is F, type f:\boot\ bootsect.exe /nt52 ALL /force.
4) Eject the Windows Vista installation disc.
5) Restart your computer.
Your computer will start in the previous version of Windows that you have installed.
6) Delete Windows Vista files and folders, such as the Program Files, Users, and Windows folders, manually.

Note: You can also remove Windows Vista by reformatting the partition where it is installed, but do this only if that partition is not the boot partition. Reformatting the boot partition might make your computer unable to start.

HEY You Do Not Need To Downgrade or Upgrade Dude.
Vista is Much Better than XP Really.
Hey Just Go To Google and Search For KEYFINDER 2.0 Beta 3
This Application Will Generate a Genuine Key For Windows Vista From Your Registry . Copy the key Given In It and go My Computer in Vista and right down there will be a change product key click on that and paste the key in the application . This Is Not Illegal This is a Microsoft Software For People Who have Misplaced the Original Key. and after you paste the key click activate or next and then your Windows Vista Will Be a Full Version.

email- arjunmanoj23@hotmail.com