When i try to deploy a agent to a xp station, i get the message:

Unable to register with the server at: https://zcmserver.
Unexpected server result. Server code: -37. Server message Newer agent
version than server version: 605340f0bd1c108b653318da9e176ac7

I am running a 10.1 server version on W2003 server.
Upgraded from 10.0.1, 10.0.2,10.0.3 and to

What can i do to fix this?