Readers, I've had this problem for a year now. It's insane. I've tried so much, I feel like I'm going crazy: All of a sudden I lose internet connectivity, not at the modem, but windows won't connect. The only thing that solves the problem is a Windows restart, I don't need to power cycle the modem or anything, since the connection still exists, but for some reason Windows loses IP address with the following Event Viewer error: Event Type: Warning Event Source: Dhcp Event Category: None Event ID: 1003 Date: 12/9/2007 Time: 11:18:36 AM User: N/A Computer: BADADJECTIVE01 Description: Your computer was not able to renew its address from the network (from the DHCP Server) for the Network Card with network address 00173FCDCE99. The following error occurred: The semaphore timeout period has expired. . Your computer will continue to try and obtain an address on its own from the network address (DHCP) server. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Data: 0000: 79 00 00 00 y... This happens multiple times a day, sometimes only once a week, no pattern, and I need to keep restarting the PC over and over again when it happens. I've already: -Re-installed Windows XP with a COMPLETE format, fresh install. -Replaced modem (Time Warner Cable Roadrunner) -Replaced network card THREE TIMES with different brands. -Replaced cable from PC to modem -System otherwise completely stable, all latest drivers, patches, windows updates, etc. What the hell could it be? Is it some bad software I keep installing, even after the windows re-install? Someone please help!