Usually, just make sure your video card drivers are the latest version, is the main thing. And obviously, install an antivirus program before you go on the web. You can literally get attacked within minutes.
You can check and see if there have been any important motherboard or BIOS updates released ... but those are usually something where you don't mess with either of them unless your current versions giving you issues. And I think Windows 7 is pretty good about taking care of that for you, so maybe don't even bother.
Other than that, as long as the system is running with no problem, you're good to go. Maybe install CoreTemp if you want to make sure the thing isn't overheating. But once Windows is installed, you can pretty much use...