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Well, yes and no. XP has that checkbox for some things, but XP does not have UAC.

Windows 7 added several levels of UAC interaction (accessible through the user account profile settings), but unfortunately I don't think there's an option to 'always allow [x] program'.

Nice, I actually didn't know about some of these.

One thing I would add; if you have 8GB+ of RAM, disabling Virtual memory will give you a slight boost. You almost never would have hit it, and...