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

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”

Article ID : 927295
Last Review : March 15, 2007
Revision : 2.4

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.

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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.

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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 (/Feedback.aspx?kbNumber=289022/) How to edit the Boot.ini file in Windows XP

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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

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APPLIES TO
• 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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Keywords: 
kbcode kbprb kbtshoot kbexpertisebeginner kbsetup KB927295

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Microsoft Knowledge Base Article

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