Why it always bring me the same windows???

I try to install latest .net framework or uninstall any old version but doesn't let me.

And even i try the .net framework clean tool don't let me to...

Yes i'm sure

Cause every time i try to install something it asked me or it blocked and this is really i don't want it.

Hi.

I want to ask you if i can completely disable the windows defender from the windows 10 system.

And if i can is it hard? Can i restore it?
How i can do it please?

Hi.

I want to ask you if it is safe to upgrade from windows 7 to windows 10?

And if i do that i keep all my win7 settings and programs or i loose something?