Runnin two Dell laptops with Belkin wireless router. Has operated perfectly for last 18 months, but now has become necessary to secure with password. Problem is as once I have set password all seems well for a short time, then one computer (always the same one) won't connect and just displays 'acquiring network address.' Eventually I can get it to connect by playing around for ages, but not necessarily repeating what I did the time before. Any help much appreciated.