Re: 0xc000007b Error
@Haanbeii Uninstall Origin "the hard way" again—even if it didn't fully install, be sure to remove any files that did appear. Then create a new admin user account on your computer and try installing it through that account. Be sure to use only letters and numbers, no special characters, accents, etc. in the username.
If you succeed in installing Origin in the new user account, you can test your games in the regular account. But if they still don't work, try launching them in the new account too.