I have 14 computers set to DHCP and since I upgraded them to Windows 7, I intermittently get an IP Conflict error. Once this happens I have a very difficult time getting the computer to reconnect to the network. I've tried rebooting, removing the network cable, rebooting the ISP's modem, setting a fake static IP then going back to dhcp, entering ipconfig /release, but nothing works except time. I am hoping for two things. 1)at the least, how clear the DHCP IP address so that the PC can reconnect to the network, 2) and at best, the appropriate Windows & network settings to keep the problem from happening again. Thanks!