VPN PPTP question: services needed to function?

My main VPN uses openvpn protocol but I have an account for a PPTP VPN. Make it a short story.. PPTP use to work and now not only has vanished from connections I had setup but will not allow me to setup a new PPTP VPN connection. Even if I check the box saying do not connect now just setup it appears like trying to setup for a second and then says can't create. Two things have changed on my pc that may be related somehow, one I just fixed and the other is my main question. Did a disk check and fixed some errors (unknown) just let it do it and then was suddenly in test mode. I fixed that with a CMD line command. I disable a few services for security reasons and need to know which services are required for the PPTP VPN to function? Also my firewall is not blocking anything and when I click try again it appears trying to make the connection but only a couple http attempts are made beside DNS.