Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

I want to install different version of Windows on a PC.

  1. I installed Windows XP on a first harddrive.
  2. I add a harddrive (HD) on my PC, split it in three part
  3. Since I have only one SATA cable, I unplugged the first HD to plug the DVD drive.
  4. I installed a working version of Windows Seven on the first partition of the second HD.

I plugged back the two HDs but I have no dual boot screen on startup : Windows XP boots automatically.

Additional information: Both system are installed on the same C: drive letter since there is no option during Windows 7 installation processus.

share|improve this question
    
Is the BIOS pointing at the right hard drive? –  Dave Mar 12 '13 at 13:48
    
Boot from the Win7 DVD and use bootrec /RebuildBcd as detailed here. –  Karan Mar 13 '13 at 1:29

2 Answers 2

Since you installed Win XP on one HDD, removed the HDD, installed Win 7 on the other HDD, win 7 does not know about Win XP being installed, similarly XP does not know about 7

You can switch between them for now by changing the primary boot device while booting, but for a long term fix, you will need to play around with your bootloader settings to "tell" win 7 about XP, and then boot via 7, OR reinstall 7 on the same HDD as XP

share|improve this answer

OSes don't know of each other, that's why you don't have boot menu.

Configure your BIOS to boot from the Win7 hard drive. I won't give you details as it differs between motherboard models.

Then install EasyBCD and use it to add Windows XP to the bootloader menu.

share|improve this answer
    
seeing my additional information, will-it work if the two system considered themself installed on letter C: ? –  Martin Delille Mar 12 '13 at 17:27
    
It will work, but you'll have different letters for the same drive (both systems will call their own drive C:) –  gronostaj Mar 12 '13 at 17:53

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.