Remote Desktop doesn't work

I could RDP to any system on my LAN just fine, but after installing COMODO Firewall, and clicking Allow for everything I’d go through, I can no longer RDP to any system.
I even disabled Firewall and Defense, but I still can’t RDP to any system. Tried Exiting COMODO, but no luck still.

I’ve tried mstsc (RDP) and my Terminals program, but nothing with either seems to work anymore.

Update: I uninstalled Comodo Firewall and remote desktop still won’t work.
Windows firewall is off, no other firewalls are installed. Host file is fine (Windows’ default).
Only antivirus installed is MS Security Essentials.

My OS is Windows 7 Enterprise, 64 bit