Yes. Officially it is "tellware" (free if you tell at least 2 other people about it) You can download it for free at http://www.daz3d.com
Some sites where one can find free wallpapers for Windows Vista are: Soc Wall, Vlad Studio, Wallpaper Stock, Cool HD Wallpapers, Zedge, and Wallpaper HD.
Windows Vista games are games that belong to Windows Vista, which can be accessed through their Windows Vista software. You can easily download free games onto your computer.
No.
No.
There are several ways to download free backgrounds. Windows themselves provide a range of free downloads, but but there are also other websites which provide backgrounds for Windows Vista.
Yes.
20-40GB depending on version. https://www.microsoft.com/windows/windows-vista/get/system-requirements.aspx
The best place to go to find the free download for HD Windows Vista themed backgrounds is techblissonline. This site offers many of the HP Windows Vista backgrounds to its users.
Sure, there are lots of free applications available for Windows.
One can find a list of free product keys for Windows Vista on PSP Support and UDG ed. Other places to find the product keys for Windows Vista is on Social Tech Net.
There is no free Windows Vista download available. The only place that Windows Vista can be downloaded legally is through Microsoft's website, and all operating systems must be paid for before downloading. If one comes across a "free" download of Windows Vista, the likelihood that it comes with a virus is high, not to mention it would be an illegal copy of the operating system.
Windows media center is available with Windows Operating systems - Vista, Windows XP Media Center Edition, and all editions of Windows 7 except for Home and Starter. If its a Vista OS may be you can call it a vista media center, so you need your computer to have Windows Vista OS.