Works great on Windows 7 HB, but has compatibility issues with Windows 8 Pro I would suggest not to go for Windows 8 upgrade, I wasted my one day in upgrading the system to Win 8 Pro and another day in downgrading it to Win 7 HB. Thanks to Lenovo for its OneKey recovery tool. It made the downgrading process so much easier. Now my 'ultra-book' works as per my expectation. Reiterating myself, Don't go for Win 8 Pro upgrade, it is waste of money