Was just wondering if you have the DHCP server enabled on the LAN set up screen?
If not, then enable it, then get the MAC addresses of your computers, PSP and then add them into the DHCP IP Address Reserving table.
Then on the 'wireless' settings, on the 'filter list' page, ensure that 'Enable Wireless Access Control' is not enabled or if it is, then ensure that all the MAC addresses of items you wish to connect wirelessly are added in the table and that 'Defined items in MAC list are PERMITTED to connect AP, others are DENIED' is selected.
Hope this helps