Run the setup again this time right click the setup file and select run as administrator.
Gurukid22 is absolutely right. Don't play with the UAC unless you know what you are doing. If you didn't know to use the "run as administrator", definitely leave it alone.
Even though you are an administrator, you are doing what Microsoft has warned not to do for years. Under XP and previous the idea was to sign on as a lessor user and only sign in as an administrator when, well, loading Office 2003 or similar. This procedure gave any worms or viruses that crawled onto your system far less power and ability to disrupt you system, but no one did it.
So the UAC was reconfigured under Vista and Windows 7 to protect us. That is why you try to do certain things, like access the Windows systems files, you have to raise your level of access. This is what you are doing with your install. You can do this in many cases just like GuruKidd22 says and you only do it for that one thing. Now when that install is done, you are back to a safer level where all requests to enter sensitive zones are forced to your review and acceptance.
Most people badly undervalue the UAC and the protection level it gives them. Take some time to read the UAC help on your system or the UAC information on the Microsoft.com website.
Nope, I don't work for Microsoft and I am not a special helper. Just a concerned citizen of the web.:icon_smile: