Wireless network problems

Hello,

My wireless network works just fine normally, I'm running a Linksys WRT54GL (http://www.newegg.com/Product/Product.aspx?Item=N82E16833124190). But when my friend brings his laptop over and starts it up, everything in our network ceases to function. Our home PC, my laptop, iPods, Xbox, other laptops, etc. -Nothing- can connect to the internet except if I plug them directly into the modem. This has happened twice already.

What I'm asking is, can a faulty network adapter or something similar cause a router to default and lose its settings? Because that seems to be happening here.
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  1. Next time see if you can connect your friend to the system via.

    If there's no similar meltdown, it might suggest there's a fault in his wired ethernet adapter or your router.

    The only similar circumstances I can think of were when a computer had previously been used with Windows Internet Connection Sharing and that (I think) had fixed the IP address -- that messed up connections with another computer. Solution was to uninstall Windows ICS.
  2. Alright, I shall do that. Thank you very much for the input!
  3. Sorry, my first line should have read "via wireless".
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