the Get should be Get(AccountPrivilegeSetName) and the argument is in square brackets, surrounded by quotes, so your If should read:
If [Get(AccountPrivilegeSetName) = "[Full Access]"]
symbister is correct if you are using FileMaker 11. If you are using an older version, use the get function you are currently using, but include the brackets to test for "[Full Access]" instead of "Full Access".
Thanks for the reply....it did the trick.