If you saw the message at the bottom it should have injected.
Before you start Combat Arms try to change the settings.ini file to the specific settings that you desire then start again. If this doesn't work go to USERS > YOUACCOUNT and turn off UAC (requires computer restart)
I hope that helped.
EVERYONE
First try this
Go to combat arms folder and open settings
Then where it says
username:
password:
enter your MPGH username and password
If that doesnt work go to the control panel and search UAC
one thing should come up
Turn UAC On or Off
click it
Turn it off
THERE YOU ARE DONE