Hopefully you install the beta version of Windows 7 which is distributed free as a second operating system, not the main operating system. With the technical words: make your PC into multisystem operation and one of them is Windows 7 beta version.
Well, how to uninstall Windows 7 beta that installed as a second operating system?
Back to Windows XP
Next step is to uninstall Windows 7 and back to Windows XP. this step only in Windows XP. If you make dual-boot with Windows Vista, see the section “How to Back to Windows Vista again?”
The step that will do is to remove the menu operating system while the computer switched on. If this menu does not exist, the computer will run the standard operating system.
1. Sign in to Windows XP as usual.
2. Insert the Windows 7 DVD into the DVD-ROM.
3. Press the [Windows] + [R] to run the Run box.
4. If your DVD-ROM drive is “E”, type “E:-boot-bootsect.exe/nt52 ALL/force”. Replace the letter “E” drive if your DVD-ROM drive is not E.
5. Remove the DVD from the DVD-ROM, and restart the computer.
6. Computer will run into Windows XP.
7. Format the drive that contains Windows 7 free version, or delete files and folders belonging to a Windows manually if the drive contains data.
8. Delete the file Boot.bak and BootSect.bak from the drive of Windows XP.
How to back to Windows Vista again?
There is no greatly difference with the installation in Windows XP. The difference only in the command in step 4. Master Boot Record (MBR) used Windows XP is NT52, while in the Windows Vista MBR is NT60. See step 4 on the “Back to Windows XP.” There are “nt52″, is not it?
Following these steps to return to Windows Vista.
1. Go to Windows Vista.
2. Insert the installation DVD of Windows 7 beta to the DVD-ROM.
3. Press the [Windows] + [R] to run the Run box.
4. If the DVD-ROM drive is your “E”, type “E:-boot-bootsect.exe/nt60 ALL/force”.
5. Remove the DVD from the DVD-ROM, and restart the computer.
6. The computer will run into Windows Vista.
7. Format the drive that contains Windows 7, or delete files and folders belonging to a Windows manually if the drive contains data.
8. Delete the file Boot.bak and BootSect.bak drive from the property of Windows Vista.
How if Windows 7 DVD lost? Just wait the next article.. 
Source: PcPlus
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