Last night my computer had an update, it closed during the reboot and the windows option doesn't show up anymore in grub. I have dual partition, Ubuntu and windows, and it always made me choose during the boot which one i wanted to load, now the windows option disappeared for some reason, the files in the computer are really important and I dont want to lose them, is there any way to restore windows?and are my files safe? I cant boot into windows . Thanks for your precious time