Verified answer

It's not possible to have a program installed only for a single user account in any version of Windows, i have even tested it my Windows Vista, you can't do this because the programs files are common for every user accounts

But the thing you can do is that just use the Windows Vista Ultimate version that have the capability to block a single user to use any of the programs you may not like to share ,using the Parental Control feature in Windows Vista. nothing more than it.

Sorry

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