I've just have my windows 7 installed by windows 8 and after a few months, i can't now open the account because of the forgotten password. To fix this, I open up my pc with the installation disc of win8 and then reset the pc, afterwards it crashes when it reach the 71% of the process. Because of this, i formatted the hard drive (partition C where windows8 are located) using cmd, then after i do this I now received the No Bootable Device- insert boot disk and press any key. But when i insert any of the win7 and win8 installation discs, i cannot boot my pc into repair. Please! My Laptop (Acer Aspire) is needed in school paper works.