As I said earlier, you may want to recheck the WEP key- it's possible you have it entered wrong on the PS3. Just to be sure it isn't some other setting, you may want to quickly try turning off the encryption for a couple of minutes and make the changes to your PS3 settings to allow for that. If you can connect with the encryption off then you'll want to make doubly sure you get it right when turning it back on again.