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Prompted for Setup Disk while Installing
http://www.vistaarticles.com/articles/275/1/Prompted-for-Setup-Disk-while-Installing
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Published on 12/10/2006
 
When you try to install a 16-bit program in Windows Vista from a mapped network drive, you may receive an error message that prompts you to insert the setup disk into the drive.

Prompted for Setup Disk while Installing

To work around this issue, copy the installation folder from the mapped network drive to a local folder on the computer, and then start the installation.

Alternatively, log on as the local administrator of the computer, and then start the installation from the mapped network drive.