How to install win7 and android OS in one device and alternative ?

I recently found a tablet http://www.tinydeal.com/saycool-101-m10-px11g6a-p-56224.html
Amazing with dual-OS built-in, which is win7 and popular android. I know a device prepared for win7 OS need powerful hardware, CPU, heat dissipation and so on. Higher requirement than an android device. So install android on a tablet original designed for windows device is more easier, but how it do though it is easier? This tablet with a intel atom n455 cpu, enough for running win7. How to transplant android to windows tablet? Anyone？