Depending on how you have your user accounts set up under Vista, if you install the game to the default Program Files path, Vista will create separate savegame folders for each user (using the path below), and then map that folder to the Beyond Divinity savegame folder so the game will just see the saves of the relevant user.
C:\Users\<account name>\AppData\Local\VirtualStore\Program Files\Larian Studios\Beyond Divinity\savegames
In order to search for the save folders, you need to do an advanced search and tell Vista to include hidden and system folders.
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