My laptop came with windows 7, I never had to install it. I have had the same problem with this twice, and I want to stop this from happening again. You see, both times, the computer would run unnaturally slow, then when I am in the middle of something (First time was browsing the internet, second time was listening to music) the horrid Blue Screen of Death would pop up, displaying an error message for a few seconds, then my computer would go to a screen telling me to install an operating system. Both times I rebooted and it would act like its just fine, but it wouldn't ever actually make it to the screen where I enter the password. (it got stuck on the Starting Windows screen) After that, I reboot and go to system restore(or something like that) and let it do its thing for a few hours, then it would start up like nothing had happened in the first place. Even though I can't see any harm done to the laptop, I still am worried. Can someone help me? Sorry, I don't have any idea what the screen said. I didn't even have time to read it, let alone take some sort of picture. Oh, and by the way, I did a full system scan with Avira (anitvirus) afterwards (both times) but it didn't pick up anything.