Maximum PC

I have searched several posts and I have had success setting up 2 routers, but both routers can see computers on the other ip which is what I was trying to prevent. Not sure what I am doing wrong.

Here is what I have
Internet----Modem---Router 1 (public)----router 2 (private)
Router 1 has the IP of 192.168.2.1, subnet 255.255.255.0
Starting IP is 100 (192.168.1.100)

Router 2 has been setup with IP 192.168.1.1, subnet 255.255.255.0
Router 2 internet IP 192.168.2.101
subnet mask 255.255.255.0
Gateway 192.168.2.1
DNS 192.168.2.1

Like I said both routers work and I can get to the internet on either IP via LAN or Wireless.
The problem I have is if my son connects to the public wifi he can access all the computers on the private IP.
I would like to have both routers to have wifi and LAN capabilities, but of course separate and secure of each other.
I guess I should also note that I set the private router to 192.168.1.1 so that I don't have to reprogram all the other devices that were already on my previous network with static IP addresses.

Note sure where I went wrong????


Windows 7 or Windows Vista computers.
Both are Linksys routers.


Thanks!