how? - ReactOS:
http://www.reactos.org/ (if you are going to test it in a virtual machine dont' use the 0.3.14 version of os, use the trunk build version its much much much better)
ReactOS is an open source windows clone and most of the windows applications work on it ! (MS office, opera, ff, ...) the good news is there is an ARM port of ReactOS - Windows RT equivalent:
ReactOS still has problems to work on real hardware because of many different components but on some PC it works very well (it can be targeted to SGT fix the bugs)
The ARM port is able to run on the SGT but there is still a lot of work to do.
Windows will soon release a Office ARM version for winRT and in order to run any windows application on the SGT a recompile is needed.
and about android there is already a port of android that runs native on windowsne emulation no virtual machine !!)
If anyone has any coding skills it would be nice to try to port reactos to the SGT or just to donate to the project with the subject "arm port for SGT"