My son was recently given a three year old laotop computer. It was originally connected to a DSL connection and I use a Cable connection. It has a built in wireless 802.11g card and a 10/100 interface. I configured it to connect wirelessly to my wireless router. The connection is established and DHCP assigns it a network address. Every 20-30 seconds it drops the connection and imediately reacqires a new connection. I disabled the wireless card and enabled the 10/100 LAN connection. Same thing. The router makes the connection, asigns a valid IP address, drops it, and imediately reastablishes the connection. The TCP/IP stack looks good. The link speed is right. Could it be conflict with some pre existing software? Maybe the old DSL software ot some instant messaging program. I loaded new antivirus software and ran a complete sucessful scan. Any thoughts what it could be?