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You cannot select the Upgrade option when you try to install Windows Vista, and you receive the following message: “Windows cannot determine if another operating system exists on your computer”

SYMPTOMS
When you try to install Windows Vista, you cannot select the Upgrade option. Also, receive the following error message in the Install Windows dialog box:

Upgrade has been disabled

- Windows cannot determine if another operating system exists on your computer. Try repairing the boot configuration, and then begin the installation again.
CAUSE
This problem occurs if the Boot.ini file contains incorrect entries. Specifically, this problem occurs if the boot path in the Boot.ini file does not have the correct location for the Windows directory.
RESOLUTION
To resolve this problem, edit the Boot.ini file to correct the entries that are not valid. For more information about how to edit the Boot.ini file, click the following article number to view the article in the Microsoft Knowledge Base:
289022 How to edit the Boot.ini file in Windows XP
MORE INFORMATION
The following is a sample of a default Boot.ini file on a computer that is running Microsoft Windows XP Professional. The following example shows a single-partition integrated device electronics (IDE) drive that has Windows XP installed in the Windows folder:
[boot loader]timeout=30default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS[operating systems]multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /fastdetect /NoExecute=OptIn
Boot.ini Upgrade Vista Upgrade has been disabled
Properties

Article ID: 927295 - Last Review: 03/15/2007 21:59:04 - Revision: 2.6

Windows Vista Enterprise, Windows Vista Enterprise 64-bit Edition, Windows Vista Ultimate, Windows Vista Ultimate 64-bit Edition, Windows Vista Business, Windows Vista Business 64-bit Edition, Windows Vista Home Premium, Windows Vista Home Premium 64-bit Edition, Windows Vista Home Basic, Windows Vista Home Basic 64-bit Edition

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