I just ran into the exact same problem while configuring my server 2008 and windows 7 vm’s in
VMware workstation 9. what helped is disabling the firewall and running the following command at the windows command prompt
netsh firewall set icmpsetting 8 enable
at that point I was able to ping one VM then both once I performed the command on both. this differnce between our scenarios is I have my VM configured using Bridged connections