have linksys 2.4 ghz router WWHT54G vers 6. It works ok with dimensions E520 computer but not with PC nor a laptop of unknow nmake. I'm using siemens speed stream 4100 modem. can't connect to AT&T with pc. I've have had a very savvy helper who gave up after several tries. help
I'm trying to find your linksys WWHT54G but failed, I think this a 802.11g model. Anyway your E520 is connected wireless so in wireless connection you need a SSID and a passphrase for this - ask this question to who ever configure your router.
The modem siemens speed stream 4100 is connected to your router. You can insert the disc which came with your linksys router to configure it to connect to the internet and other things (just follow the instructions).