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Your Upgrade Partition has Multiple Operating Systems
http://www.vistaarticles.com/articles/272/1/Your-Upgrade-Partition-has-Multiple-Operating-Systems
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Published on 12/10/2006
 
You receive the following error message in the dialog box.

Your Upgrade Partition has Multiple Operating Systems

To resolve this problem, use one of the following methods:
Move the other operating system files to another partition, or remove the files if they are unused.

Note We recommend that you install each operating system in separate partitions. 
Edit the Boot.ini file to modify the references to any other operating systems. 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 (http://support.microsoft.com/kb/289022/) How to edit the Boot.ini file in Windows XP