What Mike said, or you could click the Start menu and type in UAC, then drag that slider to the very bottom, and be done with what I have always called the User Annoyance Control, it may give a warning, ignore it, as long as you have a decent anti-virus installed, and have Windows Firewall on, then you do not need that pain of a feature on, guaranteed that solves the problem, and many problems you may have in the future.
That is there for mostly for those that know nothing at all about what is going on with their PC, that is my 2 cents on it anyway, I have built custom PC'*, and provided tech support to a lot of friends since Window 95.
Also as Art mentioned, you will most likely need the Adobe Acrobat reader, you can get that here.
NOTE: Remove the check in the box that says "Yes, install the free McAfee Security Scan Plus utility to check the status of my PC security. It will not modify existing antivirus program or PC settings." You do not need that installed for Acrobat to work.