I turned off my laptop, chose "Upgrade and close" and BSOD. Then computer restart and I See screen with turn off pc or TROUBLESHOOTING, but I can't uninstall updates, use command prompt (to use fixmbr for example). I used diskpart and what I see - no disks. So I used pendrive with windows installer and when Window with partition list was displayed nothing there, I used driver to my disk and IT turned up, but every time I close computer after it these drivers "disappear". I must every time install drivers to disk to do anything On my disk and when I install them disk gets f: letter. Can't boot Windows don't know what to do please help.