IP address confilict

“Another computer on this network has the same IP address as this computer. Contact you network administrator for help resolving this issue. More details are available in the Windows System event log”

倆台筆記本通過Asus wireless Router 上網， 最近經常出現不能連接到網絡，並出現以上的警告。有時過一段時間，又自動連接上。非常不方便，google 一下，找不到好的解決方案，請大師指教！