Windows won't update

I recently made a system restore because a program deleted some registry keys and windows didn't boot anymore.
So the only option was system restore because I don't know how to install windows.
The only problem was that is 2015 and the most recent point was 2012.
To be more specific 05.02.2012.
I know is crazy but I wanted my laptop back to life.
Now I have applications errors and blue screens if I run new programs I just installed .
And I believe the problem is Windows updates.
Since I made the restore I didn't update anything.
If I check drivers there is no exclamation mark. But also if I check for updates there are no updates.
As for Windows update that's my biggest problem.
If I check there are no windows updates.
The last one were installed in 2012, but if I check it doesn't give me any updates.
I think that's a big problem because I run 2015 programs on a 2012 laptop.
What can I do to obtain all updates from 2012 to 2015?
Date settings are corect. I checked even bios.

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