How do you get to the Internet?
Is the router used for the secure hostspot plugged into a cable modem or DSL modem of some sort?
What are you using as your DHCP server?
How are you separating the Guest network from the private network? Is this a separate subnet, and if so, what router is routing between the two networks?
In general, having multiple routers is not ideal, and of course having multiple DHCP servers will not work.