ping command returns nic card mac address instead of ip address

Hi, just this morning i had a user that couldnt access network mappings but could access internet so when i tried pinging his pc could not even get a reply so went into it remotely using logmein and was able to find out that the windows firewall was on so as a test temporarily disabled it and everything worked again but strange thing was that when i went to ping from this machine to 2 of the servers, the ip was not showing up on the reply but rather what looked like the adapter mac address which is something like fe80::8c2f.  Any ideas?