"IP address conflict with another system on the network" - I am getting this msg what should i do?

there are 2 lan connection lan and lan2 with same subnet mask and default gateway

Answers:
Notify your network administrator

Other answers:
http://answerok.com/question/;_ylt=AkximlmdSxxjWhYQ4t3wLgAjzKIX?qid=1006030309528

i hate this problem, when it happens i unplug the router and restart computers and it fixes
just change the IP address for one of the computer that is confliting.
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