A note to the awesome developers of this fine game:
So, I've only briefly run the demo and immediately shelled out for the game (haven't gotten home to play it yet).
However, I noticed some stuff getting added and updated in the Program Files directory after running the game.
I'm not sure if this is in the most recent patch, but:
If you're having issues with virtualization in Vista, you can disable for a process it by embedding a manifest resource in the exe which specifies a requestedExecutionLevel (of, say, 'asInvoker').
If you do that, you'd need to either start using the user profile for settings and saves and screenshots and so-forth, or change some ACL's under the game directory to allow those writes for Users, or something like that.
However! If you do those things, there's a fair chance some issues that might be preventing the game from running as a limited user under XP will disappear.
Cheers! And the game is beautiful, my hat off to you fine folks.
-tyler
PS: I was surprised to see the game seems to work under wine in linux, which is an unexpected bonus.