I have this wireless router LInksys NWR04B http://www.networkeverywhere.com/products/nwr04b.asp wireless router connected to my server computer. My Laptop is the IBM t40P using the Philips Agere 802.11B wireless card. Another desktop is hooked directly into the router using RJ45 cable. All the network config are set up properly(SSID, WEP KEY etc) but each time I turn on my laptop and it connects to the wireless network, my server will say IP Adress conflict with another system on the network. Here is the error message from event viewer: Event ID 4199 The system detected an address conflict for IP address 192.168.1.XXX with the system having network hardware address 00:05:4E:40:74:8D. Network operations on this system may be disrupted as a result. (After this, my laptop remains connected and my server loses connection to the net) This error message does not happen if my laptop is connected to the wireless network first and then I turn on my server. It only happens one way: server connected to net, turn on laptop..bam..error. All computers are set to receive Dynamic IP adress from the DHCP server. so what is going on here guys? please help me :( Another problem is that no computer can see each other's shared folder...no matter what i do...please help me out here guys.

The hardware address is the MAC address of one of the systems. You need to go to each system and run WINIPCFG and record each ones "Adapter Address" or MAC address and its IP address. Then access the router and find out what its MAC address is set to. Then check this against the MAC address marked on the box and the MAC address on the Internet modem if you have one. Then see if you can sort out what is wrong. One may be read wrong. It is also possible that one of your system's MAC address has been cloned into the Router to solve a problem with connecting it to the Internet, so that it and one of the systems has the same MAC address. NOT.