Google is not an OS but a website. It does not install software but Windows does.
You could easily download Chrome for Ubuntu OS. It is available on the Chrome website as well.
it is mac os. Their versions are too good and easy for users.
Download the JRE (java runtime environment) from Sun's website. make sure you get a version that will run on your os.
The official name is Google Chrome OS. Work began in 2009 and was launched in 2011. The address is Googlesystem.blogspot. This has information on how to install it on your computer.
The Free OS website lists available free Operating Systems. (See links below) http://www.ubuntu.com would be a good place to start. It is a Linux distribution, but don't get frightent by that, it is very easy to use, even if you have never worked with anything but windows.
android is good but not the best , ios is the worlds most advance os.
Windows 7
It would depend on the version you are running. If the OS was preinstalled it should be fine. You can check the requirements on the Microsoft website.
The best bet is probably the Adobe Flash Player for Mac OS X is available from the Adobe website.
You would have to go to the website of the OS you wanted to install.
You can go to the main website of Minecraft(.net) to purchase and download the game for your OS