You don't. Its already installed.
Yes, you can do it, but firstly you have to install XP and Windows 7 must be installed afterwards. Moreover, you must create two partitions to install them.
first you need to patch your system using universal patch, there are three files to patch, after patching choose a glass theme to be installed
That depends on what exactly you mean by that. You want to run Windows XP within Windows 7 you need to install Microsoft virtual machine. It's free. You want to replace Seven with XP, then you will need to format the volume where Seven is installed and then install XP.
it already comes installed with windows 7. type aero into the start menu to load it.
Yes, you can but you have to install Windows 7 in another partition.
How to install the IIS on Windows XP
You cannot imagine how great it would be if Seven could do that. In order to install you have to burn that image on DVD and boot from that DVD (or start installation Windows if the image which you have supports such mode, not all of them do).
No. You can install windows 8 directly from a USB or CD.
I would use Windows Basic theme.
You can not install any form of windows on the PS3
You can install so called Microsoft Virtual PC on your Windows 7 and use all your programs under Seven. Seven has own appearance, it looks better than vista.
Sadly you can install windows on the ipad. It is done by apple inc. and wont allow windows