One interesting option included in Microsoft Windows XP operating system is the ability to uninstall Windows XP from within the XP itself, if you were able to performed an upgrade from Windows 98, 98SE, or Windows Me.Here are the procedure for uninstalling the Windows XP from your computer using command prompt.It is important that the uninstallation of Windows XP from the computer using command prompt is available only if a successful image of the previous operating system(Windows 98, 98SE, or Windows Me) was created during the Windows XP upgrade.Also note that this trick can only done if you are logged on Windows XP as a user with administrative rights or, and of course as Administrator.
*Boot the Windows XP computer to Safe Mode by press F8 simultaneously before the windows logo appear.
*On the command prompt from the safe mode, just type cd\, and then press Enter.
*Type in “cd\windows\system32” into command prompt and then press Enter.
*Also type in “osuninst.exe” into command prompt and then press Enter.
*An on screen instructions window will appear and it will guide you through out the Windows XP uninstall process to revert to the previous operating system.
Note:
The usual method of uninstalling Windows XP is done by booting into XP normally and uses the Add/Remove Programs tool in Control Panel to remove it. If you are unable to start Windows XP normally, another option is to load XP in Safe Mode(By press F8 simultaneously before the windows logo appear) then use the same procedure.If unsuccessful to boot normally or boot into Safe Mode,Windows XP can be removed by using Command Prompt