Cant ping windows computers with new E4200 LAN/wLAN

just replaced a WRT54G with E4200. Most functions work well. 4 wireless computers (1 Macbook, 3 Win 7), 1 wireless android, 1 wired Win7 computer, 1 ethernet connected hard drive, 1 ethernet connected printer. All computers can ping router, access hard drive, access internet, ping android and ping Macbook.
However, router, nor any computer, can't ping Win7 computers. Apparently IP based connections between WinX computers is blocked. My real applications are to Remote Desktop Connect from 1 Win7 computer to another, or to run a DLNA music server on 1 Win7 computer, accessed by another. (the LAN connected computer is the server, accessed by a wLAN client. All worked fine on WRT54G router, but can't connect thru E4200.  When these apps failed, I tried PING, and that failed as well.
All computer's IP addresses are properly served from E4200 via DHCP, and are visible thru the router's DHCP Reservation panel.
Cisco Tech support suggested turning off the router firewall, and then turning off all of the internet filters, but neither of these ideas helped.
Any thoughts

Did you reconfigure the firewall on the Windows computer? You have connected the computers to a new router, i.e. a new network and it should be by default untrusted.

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