I have a D-Link DI-524 Wireless router set up in the office downstairs, this is connected by CAT5 cable to a D-Link DWL-G700AP access point upstairs (as the wireless signal from the office did not reach between floors). There is also a printer connected to the office router to enable printing from any client on the network. Both networks have security enabled (WEP on the upstairs access point, WPA on the downstairs office network. These have been working fine, with 2 laptops being able to connect to either network, choice being made depending on which offers the better signal strength. However, one laptop will now not connect to the AP upstairs, although the other still works fine. The downstairs office network is still able to be connected to by both laptops. I have tried all sorts to fix this, resetting both networks, etc, but am totally bemused as to whay this is happening, please let me know if you have nay suggestions!