Windows Anytime Upgrade is just Microsoft trying to get you to upgrade to a higher version of your OS: click here
Recovery CD - keep this very safe. You'll need it if you ever have to repair or reinstall Windows.
The Asus Support CD? I'm not sure, but it may be some method of getting support from Asus to deal with problems on your computer. Or it may simply be the drivers needed to put your computer back to its original purchase spec. if you ever need to reinstall Windows.
Didn't you get any kind of manual with the computer - either on paper or on your hard drive? If so, I suggest you read it. It should explain all of these details.