Need help with UAC

My son just bought a new game called Warhammer Online: Age of Reckoning. Since the game lags on his computer, I let him install it on my computer. I've had several problems with this game and I'd really appreciate it if my question is answered.

1. Whenever my son accesses the game Warhammer, the UAC pops up and requires Administrator password. My son is a good student in school so I let him use the computer anytime he wants; so when I'm not home he wants play Warhammer. I cannot give him the administrator password. I've watched the Task Scheduler with IT Dojo and it still doesn't work. I've tried giving permissions to his account on the computer and it still doesn't work. So I found the folder of Warhammer and there is an application to the game that has no UAC, but when I tried to open it, it says that it cannot run properly and told me to use the version that requires UAC. I'm out of ideas so if anyone can, please answer my question!