I'm waiting for the year of the windows on the mobile

Me somehow too (even though it seems not to be very possible). The recent trends OSX and Windows take are kinda scary. Windows 8 isn't anymore what I call a desktop platform and OSX became restricted and buggy since OSX 10.7 Lion (called the Windows Vista of OSX versions). Both go more and more into tablet-OS-design but I still don't see (and many others too) what should be the advantage of this. Only the companies itself have some good advantages and reasons to do that.

I hear barely any positive comments or talks about the Windows 8 enhancements, but a lacking competition makes companies force stuff on end-users they don't really want.

How can I run linux on my computer?

Go to [1], pick a distribution of your choice* and install it to your HDD.
Prior to that you might want to test some candidates that you think are promising in a virtual machine or as a live system.

[1] http://distrowatch.com/

*) No, I won't tell you which one is best, because there is no such thing like a "best" linux distro since that highly depends on your preferences.