Get one of your friends to create a Ubuntu live CD image with the instructions on this web site.
http://www.ubuntu.com/download/desktop
You do not need to install Ubuntu, just run it “live” from the CD.
You will be able to tell if you have a hardware problem, or if it’s Microsoft.
You either need a new keyboard, or an new person sitting between the keyboard and the machine.
I’ve been using Windows 8, from the developer trials to the present production version, and, nothing even remotely close to what you claim to be a problem, has come up.
Perhaps you need to clean your keyboard and remove all the food crumbs between the keyboard keys. At the worst, what you might need is a new keyboard. But, you don’t need to blame Windows 8 for what is apparently, hardware related.