Sorry to hear that, it seems to point back to a problem with the router, does the router have a firewall?
If so, set hosting PC to DMZ:
A DMZ (demilitarized Zone) is a conceptual network design where publicly accessible servers are placed on a separate, isolated network segment. The intention of a DMZ is to ensure that publicly accessible servers cannot contact other internal network segments, in the event that a server is compromised.
A Firewall is particularly relevant in DMZ implementation, since it is responsible for ensuring that proper policies are in place to protect local networks from the DMZ, while maintaining accessibility to the DMZ.
Due to the non-trivial nature of DMZ implementation, it is not recommended to attempt a DMZ unless you have a strong familiarity with networking. A DMZ is usually not a requirement, but is generally encouraged by security conscientious network administrators.
For some home routers, it refers to a DMZ Host. Strictly speaking, this is not a true DMZ (Demilitarized Zone). A home router DMZ host is a host on the internal network that has all ports exposed, except those ports otherwise forwarded. Which is often used a simple method to forward all ports to another firewall /NAT device.
Regarding Enurmerating session error:
Baseline for debug:
Set services DHCP and UPNP to run at startup on the Host
Open port range and/or set DMZ
Uninstall, Reboot Delete any leftover files and folders
Do a clean install in a new directory
Don't install in (x86)
Don't allow windows to set compatibility.
We can now work from there...
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