Question : Why can't I ping computer on network?

I set up 3 computers on a linksys wireless router (two wireless and one hardwired). Two of them are a client's computers and one of them is mine.   All computers have internet access via DHCP (addresses 192.168.1.100 etc) however from my computer, I am unable to ping the other 2 computers, whereas the other computers are able to ping mine.  All computers have the windows firewall turned off.

What could be configured differently about those computers that they can't be pinged?

Answer : Why can't I ping computer on network?

i would check for any other firewalls running on the other 2 pc's as well.
hth
Jason