Destination Host Unreachable Error

Two things you could do :

1) On a windows machine go to C:\Windows\System32\drivers\etc\notepad hosts
(You would have to run this with admin rights )

Make sure you remove any prior mapping of your host file.
Try pinging the machine again.

2) On a command prompt, type arp -a
For a list of the currently available/reachable Ip's. 
See if the IP you are trying to ping is listed there.

For additional information, follow the stack overflow link here.

http://superuser.com/questions/453933/pinging-a-machine-on-my-local-network-gets-an-unreachable-response-from-my-own