Hi, my notebook came with a genuine copy of windows 8 when i first purchased it. Some months ago, something happened which forced me to format my hd. By doing this, it removed the genuine copy of windows 8 and it installed an evaluation copy of windows 8. After some time, my license has been expired. Now there is a problem, when i try to boot a copy of windows or ubuntu from usb or cd, it won't recognize it when i go to the startup menu. If i go to my computer, i can see that its there and I can open it by clicking it. Also my pc shutdown's after like half an hour or something, is it because i didnt activate my copy of windows? Please let me know what i can do.