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Error Message:"Windows cannot determine if another operating system exists on your computer" when I try running upgrade for Vista!

To fix this, your need to edit the Boot.ini file and correct the invalid entry. This article explains how to troubleshoot the error mentioned above

You get the above problem when the boot path in "Boot.ini" file is incorrect or it doesn't have the right location of the Windows directory. To fix this, your need to edit the Boot.ini file and correct the invalid entry.  Here's how you can do it:

Before you proceed, ensure you make a backup copy of "Boot.ini" file and then edit it.
  1. Right-click My Computer -> Properties. (or Click Start -> Run, key in "sysdm.cpl", and press Enter).

  2. Click Advanced tab and under Startup and Recovery, click Settings.

  3. Under System Startup, click Edit. (This opens the file in Notepad ready for editing)

  4. From the Notepad menu bar, click File -> Save As.

  5. Enter a file name and click Save to save the file.

To edit the "Boot.ini" file, follow the above first 3 steps and when you get into the notepad.  You can make the changes and save the file.

Here's is a sample how Boot.ini file looks:
[boot loader]
timeout=30
default=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
This is a sample of the above Boot.ini file with a previous installation of Windows 2000 on a separate partition.

[boot loader]
timeout=30
default=multi(0)disk(1)rdisk(0)partition(1)\WINDOWS
[operating systems]
multi(0)disk(1)rdisk(0)partition(1)\WINDOWS="Windows XP Professional" /fastdetect
multi(0)disk(0)rdisk(0)partition(2)\WINNT="Windows 2000 Professional" /fastdetect


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Type:ArticleContent
Updated at:27 Mar 02:07
Updated by:Remo
Tags: vista windows vista
Keywords:error message while upgrading to vista, upgrade error, vista upgrade error, Error message, vista error message, windows vista, Boot ini, ini file, multi disk, disk rdisk, rdisk partition, vista upgrade, upgrade error, partition WINDOWS Vista, upgrade Vista
Brand: Topic > Troubleshooting
Article Source > Authored in Zolved
Brand > Microsoft > Windows Vista