Windows 7 I liked except the PK3 issue with 64 bit version, I have no idea why they didnt let win 7 go on abit longer??? I like win 8.1 better now I have the classic start button, but I still prefer win7 or XP. I tried putting win 7 on this laptop but it wont have it, somehow its locked into using win 8, one thing I totally hate is the auto update thing, that insists on shutting you down when you dont want it!
I also cant install Linux on this laptop, so I am pretty sure there is something in the Bios to stop it