Well, you might have to wade through this technical jargon, but there are reports of the Win 7 firewall being disabled, but ports still being blocked. You could try google.
First though, go to control panel, system and security, under administrative tools, click on view event logs. Under windows logs, click on security. You can click on filter current log while on security and check error, critical, and warning. Look for a culprit there.
You might want to try enabling the windows firewall and click on allow a program through windows firewall and add c-rpg. (if it WF isn't turned on already)
How did you disable it anyhow? Control panel, or services?