WRT54G - Lost Settings

I have had my WRT54G running my home-office network successfully, for 14 months - 2 wired desktops (1 on XP and 1 on Vista) and 1 wireless laptop on Vista.  A couple of days' ago, I went into my Linksys software to retrieve my "router password" so I could temporarily  hookup a guest's wireless laptop.  To my surprise, I was greeted with a "setup" window, and the following happened when I attempted to redo the setup (by the way, when I started to redo the setup, all 3 of my computers, including my wireless laptop, were still networked together, as well as able to be on line!): The setup made me redo my password, and then when attempting to "find" the router, named the router on the right side of the window and stating that "Network Status" was OK, but in the "tree" - it had (still has)  the yellow warning triangle, along with a "No Router" message under the grayed out router icon.  In the tree, under "Other Devices" - I get "No Devices", and "Computers" - "No Computers."
Since this new "setup," I do not have access to networking between my 3 computers, as well as my (wireless) laptop not being able to go on line.  However, my wired desktops are still on line, but not able to network between them.
HELP Please!  Do I need to delete my Linksys software and start over? - or, is there possibly something wrong with my Linksys router?  By the way, I am connected through a Cisco 678 DSL Modem.

Thanks Binky!  Both of the desktop PC's are in the correct local IP address range, and I know what the laptop should be, but of course, it won't show because it's not connecting to the network or to the internet.  Ping on my XP desktop (which is the host computer) checks out, but Ping on the other desktop (pinging itself), gets a "general failure", which I'm guessing is (even though it's on line) because it can't connect to the "home network."
We still need to go back to what I believe is the original problem, and that is the fact that the router is still not totally recognized (see my note regarding the "grayed out" tree, saying "No Router).  I believe that our desktops are on line only because the connection is passing from the Cisco 678 DSL modem THROUGH the Linksys Router, and if I hard-wired my laptop to the router, it would be on line also (but, still not networked)!  So... my question still is... do I need to disconnect everything, uninstall the Linksys software and start over... or can I reinstall over the top of the existint software... or do we think my Router actually is defective? 
The 3rd option seems weird to me (defective Linksys), considering until I discovered it wanted me to redo the setup, all 3 computers were networking successfully together and on line, including my laptop on a wireless connection. 

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