connectivity

I have four PC connected with 8 port switch.

In one pc there are two lancard.one lancard for connecting local network and other has configured for internet service

all other pc can use internet through proxy software-“freeproxy”

Problem-from other pc,when i am trying to ping ip address of ISP(configured in proxy server)its reply “destination host not reachable

Local ip range 192.168.5.**/225.255.255.0 no gateway

can any one help??