I tried deleting the lang0.pak but it did't work and when I open the english patch i don't have the option to unpatch?

You have to actually repatch the game after you delete lang0.pak.

The unpatch option is only in the new English patch.

The patch does't give me the option to unpatch and deleting lang0.pak did't work.

I don't believe there are any except lang0.pak, but delete every lang#.pak then. If there's only lang.pak and lang0.pak then deleting lang0.Pak and repatching will untranslate the game.

And what do I do then?

To fix the error that the new English patch gave you, download this.

Just tried, it dosn't work.

Would it be easier, if I remove the whole game and then install it again?

Downloading and installing that should fix the: "The program can't start because MSVCP100.dll is missing from your computer..." error

So what do i do after I remove the game and then install it again?

When I try to run the newest patch in admin after removening the old one, it gives me the MSVCP100.dll error, and when i try to download the fix, it tells me that i have a newer version?

What the hell do I do? :/

Should i just remove the whole game and get it again?