I have partially setup my router to the internet. I am able to ping from the router successfully, however i am unable to ping the rtr from another pc.
my setup:
gns on a windows 7 laptop with a wireless nic with ip address: 172.26.0.9 /24
ms loopback setup with sharing from wireless nic. loopback address: 172.26.0.10 /24
gns router has fas 0/0 with ip address 172.26.0.11 connected to cloud (cloud is connected to loopback)

i can ping from router to another pc. i can ping from another pc to the laptop nic address.
I CANNOT ping from another pc to the router address.

thanks for any help!

you need a default route pointing to the loopback address. You will also need to add any networks you use into Windows using Windows Powershell.