BlueStacks app player
It is a software for windows to run android apps on pc.
link for downloading ofline version-
http://www.bluestacks.com/download.html?utm_campaign=homepage-dl-button
But if you want to change your os then you have to lost your gameplays and install new version of bluestacks. but now you don't need to lose your scores. here is the way by which you can get your old bluestacks.
you should have online bluestacks.
step 1-press windows+r (run) and copy this text-C:\programdata and press enter
step 2-copy two folders named 1.bluestacks setup 2.BlueStacks from program data to any of your location on other disk.
step 3-install new window and then once again open folder as in step 1.
step 4-now paste 2 folders that you copied in step 2 to this folder.
step 5-now close folder and run bluestacks online setup.
after bluestacks installation run it. for some time it will show downloading game data but soon it show inialising and open your old bluestacks.
A way by new ways