HP 250 G1 Notebook PC prodyct number: H6E17EA#ACQ.i bought my laptop with windows 8 64 bit.then i created the partition in my pc there was a new drive which was D: after a while i accidentialy formated the drive.an i couldnt refresh my PC anymore.then i get update for windows 8.1 and i install the update then i switch off my PC,then the following day when i try to start my pc it was booting to a repair loop.then itb shows a blue screen.then i downgraded to windows 7.now i wish to go to windows 8.what should i do.how can i do it THANX