Can't Sign On Automatically Without Constant

I experience the "identifying 'network'" only when I sign on automatically, yet I do have an internet connection and networking works flawlessly; when I sign on manually there's only a very brief instance of it and after that all is normal. After literally spending days on this and trying all sorts of configurations for the router I still can't avoid this issue when I set networking properties to connect automatically.

Got a late model Dell PC/Vista Home Premium 32 which connects with no problems to my AT&T dry loop DSL Siemens 4100 modem which is connected to a new Linksys WRT54GS router which is picked up by an HP laptop/Vista Ultimate 32 with BROADCOM 802.11 b/g network adapter and NVIDIA nforce networking controller. As far as router configuration goes, I have tried the following applicable settings; Automatic Configuration-DHCP, Mixed Wireless Network Mode, Wireless Channel 6, SSID Broadcast as enabled and as disabled, Security Mode as WPA Personal and as WPA2 Personal, WPA Algorithms as AES, TKIP or AES+TKIP respectively. Also I have tried various connection scenarios in Wireless Network properties. Again the bottom line is that while I do have a network and internet connection, I can't sign on automatically without the constant "identifying 'network'" issue and when I sign on manually all is well. Never worked with a router before, Linksys customer support is an absolute trip with no destination and I'm hoping someone here might give me a few clues.