Hello, actually the problem with my pc starts after windows update. My previous OS is Windows 8.1. After not loading for some time and I couldn't get to Device Manager, I was thinking to just install another OS and reboot. I read somewhere that before installing OS I would need to do disk cleanup, so I did just that. But now all my files from 4 disk partitions are gone along with the previous OS. On this website some posts said that installing the new OS means my data will not recover, ever, so I am refraining myself to install it for now. Any help please??