One Router - 2 Range Extenders?

I have a friend with a very large area to cover with internet.He already has a Belkin F5D7634-4 wireless modem router.Connected to this is a Belkin F5D7132 wired as an access point using an ethernet cable and adapter. Working perfectly.I need to add a second Belkin F5D7132 wired as an access point using an ethernet cable and adapter. This is to give coverage in another area of the building.My problem is this:-Both access points work perfectly on their own.

Router - IP 192.168.2.1
Wired access point 1 - IP 192.168.2.256
Wired access point 2 - IP 192.168.2.250
Router + Wired access point 1 = WORKS
Router + Wired access point 2 = WORKS

Router + Wired access point 1 + Wired access point 2 = NOTHING WORKS (router goes bonkers and all the lights flash very fast)What do I need to change to get them all to work together?I have spent an hour on the phone to Belkin support, they took me through the steps to install a wireless range extender.