If you suddenly got some unexpected behavior on your Windows 10 PC, then the first thing you should do is take a diagnostic approach by way of elimination. There are plenty of factors which can be the cause of issues like slowdowns, BSODs, freezes and even sudden reboots. The best way to detect what exactly is the cause of the trouble is to perform a clean boot. Using a clean boot, you can find if the OS is damaged by some third party app or a bad driver. By preventing them from loading, you can exclude the influence of these two factors.