|Your request is an advanced topic but can be done.|
You would need to setup ICS [internet connection sharing] on your pc between the wired and wireless nic.
4 pcs going thru your pc will have very poor internet performance.
Additionally to get ics to work you need to have the wired nic at 192.168.0.1 and the other 4 pcs will have to have static ips in the same range. This means you have to disable dhcp server on the router and change its lan access port [gateway] to something like 192.168.0.254.
When on the router all pcs will have to have 192.168.0.254 for gateway.
When on ICS connection they will have to have 192.168.0.1
I would get my internet connection fixed before going to all this trouble.