Hello, I'm new to this forum, so sorry if I post this in wrong place. Now from the title you can guess what it will be about but I will put it in more detail. Yesterday's evening I was watching a movie on my Asus P52J lap top and then I decided it's time to sleep so I went to brush my teeth (I left the computer running) but when I came back lap top's screen was black and it said "disk read error press ctrl+alt+delete to reboot" (or smth similar) when I rebooted the same screen popped up so I just pushed the power button to power off. Then I removed battery and put it back in (in the past it helped for other crashes). When I started my pc that window came up with two suggestions to run windows normally or to fix it. I tried to start it normally but on the windows animation screen the "windows" didn't show up and it automatically started system recovery... It took forever to load it. But when I got to the system recovery tools I saw that it says "Operating system: Unknown on (Unknown) local disk" . It really startled me. I decided to go with Startup repair. At first it was scanning for errors and then it said that it was fixing them. But it keeps on fixing them for hours. I don't know what to do... I don't have the windows 7 home premium x64 original disk because I got the computer with already installed windows. So can anyone help me at all? (Sorry for bad English)