Shoutbox

This problem has bugged me for a while. We have two computers on a wireless network connected to a router (which also is connected to the internet).

Computer A connects to the network without problems, when I shut the computer down and start it back up it works fine. Then as usual connects to the network. I can do this over and over again, without a hitch.

However Computer B has many more bugs. I can connect to the network the first time I start up the computer, but then after a shutdown, 90% of the time afterwards it tells me it has connected but will not communicate with other parts of the network properly (for example I can't even ping the router), then it disconnects and reconnects over and over again, however even in the brief intervals it has "connected" no activity happens between itself and the router, so I can't access the internet or any network resource.
The Belkin tool is still able to give information on the connection signal, and in the 10 seconds the computer connects the signal is usually between -55 to -70dBm, with low noise, which is very good for a wireless network, so I doubt signal and distance are a factor. However Computer B is further away from the router than Computer A, because the signal is so strong I doubt that is the cause.

The only way to get computer B to work again is to restart the router (turn off the router and turn it back on). And then it will be able to connect.

What is puzzling is how both computers have the same exact Belkin 54g 802.11g wireless network card. As well as that both computers use Windows to manage the connection to the wireless network. Both computers assign their own LAN IP addresses (Computer A is 192.168.2.102 and Computer B is 192.168.2.103) however the problem still occurs even if the router assigns its own IP addresses using DHCP. I used to be on channel 11 and got the same problem, now I use channel 1, however channel 11 was used by my next door neighbours and interfered with the network (which is a separate problem that is since resolved) so I switched to channel 1 (the problem of computer B not connecting properly after a restart still happens on channel 1 and several other channels I have tried). The network uses WPA security, and MAC address filtering, however the problem still happens without these features enabled. I also block WAN pings and have uPnP enabled (however uPnP being disabled still gives the problem).

The router is a Belkin 802.11g 54g FSD7630-4A (UK). There is a firmware update out however it does not seem to have anything changed that can fix this bug, and I do not have an Ethernet network card and cable to update (it can not be updated over a wireless connection as the Belkin website states)

Computer B can pick up other networks in the area (about 2 from neighbours on my street). Computer A can only pick up one other network from my next door neighbour.

Thanks to anyone who can shed light on the problem and get Computer B to be more talkative. If I have not been very clear in stating what the problem is please tell me. Thanks in advance again!