I downloaded something and my firewall gave me a warning that a trojan horse (Atros3.AGMY) had infected my pc. There was a program installed in the C:\Users\Reinier\AppData\Local\Temp folder called codecfixdivx.exe.
The trojan somehow disabled my administrator rights. When I open apps I get the message "Mail cannot be opened with the built-in administrator account. Log in with another account and try again".
As suggested by the malware removal guy I ran the Farbar recovery scan tool twice with different fixlists. I don't know exactly what this did. Also I restored the Administrator's account. (http://www.tenforums.com/tutorials/2969-administrator-account-enable-disable-windows-10-a.html) But with this account it gives the same errors upon opening apps and using this account I was not able to remove the trojan using the farbar tool and the given fixlists either.
The codecfixdivx.exe is still there and I am still not able to open apps.
I hope someone can help me. Thanks in advance.