Hello, so I'm having issues on Windows 10

Can someone please help me, Windows 10: Store and Metro apps won't open, they just crash. Windows Defender won't turn on Windows Update keeps crashing my computer in the process of updating, when the system is offline Does anyone have solutions. Normally a computer person I am, are supposed to know how to fix stuff like this but can't because nothing helps. I really don't wanna install windows and start over.