If you get a "blue screen of death" error screen in Windows,don't get panic because it can occur due to some small reasons-

1) Due to latest driver installation

Solution : Switch back to your old driver.

2) Due to windows update

Solution : Roll back update

3) Switching off fast boot option

Solution : Restart your computer and quickly switch on fast boot

4) For disabling hyper-V feature

Solution : Enable hyper-v again or completely switch it off.

5) If you mount a drive (where Windows operating system is kept) in another operating system(Dual Boot) and without un-mounting it if you start Windows

Solution: Unmount the drive from another OS first then start Windows OS.