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Okay I am trying to do an in-place upgrade Windows XP to Windows 7, via Vista, but I am running into a problem.

I put my Vista disc in for the initial upgrade but when I get to the part where it asks if I want an Upgrade or a Clean install, the upgrade option is greyed out, and there is a message on the bottom that says the following:

Upgrade has been disabled.
-Windows cannot determine if another operating system is exists on your computer. 
Try repairing the boot configuration and then begin the installation again.

Can someone tell me why this is hapening and how to fix it?

Also, it is Windows XP Pro, to Windows Vista Business, to Windows 7 Pro, all 32bit which I checked the upgrade paths and this should work...

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You are trying to install Windows Vista from within Windows right? I would contact Microsoft for assistance. –  Ramhound Nov 15 '13 at 16:28
    
Yes... I am trying to install Vista from withing Windows... –  TheX Nov 15 '13 at 16:38
    
Have you tried repairing the boot configuration? Should be a simple enough process, boot into the Recovery Console, use a command which is harmless if there is nothing wrong with it. –  Ramhound Nov 15 '13 at 16:40
    
Am I supposed to use just "a command" randomly? –  TheX Nov 15 '13 at 16:41
    
Repairing the boot configuration is a seperate problem. You didn't indicate if you already tried that. I was just indicating the command that does repair the boot configuration is harmless if it doesn't require repair. –  Ramhound Nov 15 '13 at 16:51

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