Ping warning - duplicates found!

I am getting PING WARNING - DUPLICATES FOUND! Packet loss = 1%, RTA = 1.22 ms. But when I ping it from the desktop it pings ok. any ideas.

Sounds like there are more that one mac addy attempting to use an ip to me. Look on your swithes/routers and track down the offending mac addy using the Arp tables in them.