First you can check if it is enabled or not by running
netsh dhcp server show detectconflictretry
Then, if it is not enabled you can run
netsh dhcp server set detectconflictretry 1
Obviously run with 0 to disable.
netsh dhcp server set detectconflictretry 0
Resources:
http://technet.microsoft.com/en-us/library/dd183587(v=ws.10).aspx