why would you need an openvpn service on a work pc to make a connection back to the work network?
openvpn 2.2.2 comes with an OpenVPN service which can be configured to run at system startup; config files for this service are in
c:\program files\openvpn\config
c:\program files (x86)\openvpn\config ## 64bit
IIRC the openvpn service simply executes all .ovpn files from this directory, so be careful when putting multiple files in that dir.