Sounds like a fresh install would be best idea. Have you got the latest version of win 10?
right click start
chose run...
type
winver and press enter
If it reads Build 1607 you have the latest
if you are on a previous version, you can either go
here and click download tool now. This will download the windows 10 media creation tool that will let you make an installer on USB or DVD. Once its created, I would open explorer and navigate to dvd/USB and run the setup.exe file and use it to upgrade your win 10 top latest build - it would most likely fix all these things as it installs a brand new copy of win 10 on PC.
If you already on 1607, you could try this in command prompt (admin) - copy/paste it as it needs to be exact
DISM /Online /Cleanup-Image /RestoreHealth
its an op version of SFC, it cleans the image reset uses to fix windows.
if it comes back with an error asking about source, and you are on build 1607, you can try the following:
Download a copy of the win 10 iso from
Here - create ISO by telling it you want to make DVD - and then mount that ISO in file explorer (see
Here) and then copy paste the below command into command prompt (admin)
DISM /Online /Cleanup-Image /RestoreHealth /source:WIM:X:\Sources\Install.wim:1 /LimitAccess
Where "X" is the drive letter where the ISO is located. Simply change the "X" to the correct drive letter