If you mean os, no you can download it on Windows, Mac, and Linux even (if anyone uses linux...) and if you mean web browser I think you may use any but might need java.
$26.95
You need a premium account that you can create from minecraft.net. This requires money. then go to the home page and look for the minecraft download then download the game and save the .EXE to your desktop. then when it is done open it, log in and play!
You can download Windows 7 from related links. Big download though!
first you need to download the windows anytime upgrade, windows 7 user already have it. then you need simply buy windows 7 ultimate and then open windows anytime upgrade and follow the step by step instructions
The best one to download and install whould have to be Java 7.
Yes you can download it on windows 7 :) x
yes
Download it from Minecraft's home page, or go directly to the download link found below this answer.
yes. you will need the CD for it though.
No, but you need a Windows operating system not mac OS or Linux as it's native to Windows. I'm almost certain it will run on Windows XP and vista aswell.
Yes
Minecraft costs £17.95 or $26.95