How do you enable permissions from an Admin account?

I installed photoshop CS2 from my dad's admin. account, he makes me use a guest account, but I can't run it now. It says "You are not allowed to continue because your account does not have the proper privileges. Please log in using an account with administrative privileges and try again." Strangely I can use Image Ready, but not Photoshop. I reinstalled it(When my dad left his account up) and I thought I got it but nooooo. So, how do you enable program permissions? Please heeeelp.

I think only the admin (your dad's account) can change permissions under Control Panel > User Accounts

But I thought that you could like individualy set program rights, not just user/account rights.

CS2 didn't prompt you to set it for all users when you installed it while in the admin account?