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Have you tried Linux ? There are a lot of flavors to choose from. Ubuntu is really popular for Desktops but there are others.

If you want something similar to the Windows 7 UI wise, but running Linux, run KDE on top of whatever distro you choose. Some come with it already like Kubuntu (Ubuntu OS + KDE) or Gentoo.

If you're looking for something completely different, there's always Ubuntu's fork of Gnome (Unity), which is Ubuntu's default desktop. There'a also Gnome 3 as well as XFCE and some others.

Android runs on x86 too. In theory, at least :|

Not just theory. You can have x86 builds if you like.

I know, because I ran it on my Netbook.

Check out http://www.android-x86.org/

From the site :

This is a project to port Android open source project to x86 platform, formerly known as "patch hosting for android x86 support".