How do I give the game Admin privileges? Do I have to reinstall the game?
Nope, no need to re-install.
Right click the shortcut icon for Contract JACK in your start menu, task bar, or desktop. Click the Compatibility tab. You should see a checkbox labelled "Run this program as an administrator". Put a checkmark in it and click OK. Now the game will start with Administrator privileges.
A lot of games, especially older ones, expect to be able to do whatever they want with no restrictions. On XP, your user account was set to have Admin privileges by default so this never mattered. But starting with Vista, user accounts do not have Admin privileges by default and programs are restricted in what they can do (in the name of security).
So a number of games start having problems because of these new restrictions, and they don't always crash or give an error message to let you know about this. They just start behaving oddly.
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