You didn't supply the DSL modem part number but early ones had us install PPPoE software and then that machine could not use a router. If I factory reset the router then it doesn't work either.
Vista doesn't connect to all routers. I can't know if your WGT624 is one of those or if you made the changes to Vista to help this issue along.
Your post is lacking the details needed to start a discussion.
All of the lights are light correctly. I am unable to connect to the internet through the router. I can connect through my modem.
I have windows vista and dsl.