network has implemented, now does not

I had a network set in place on my router WRT54G2 for about a year now.  Recently, I had a friend help me clean up my computer by using the recovery discs.  When I brought my home computer and attempts to connect to our network "existing" which I had put in place some time, he had put me up a new network.  Do not think it would affect what I have advanced and set up with the same preferences I had previously.  Now my roommate's computer is unable to connect to the network.  Initially, he was getting a certificate error saying there wasn't none is available to connect.  Now it just expires himself completely.  Says he connects, but abandoned finally just without error.  Is there a way to start over from scratch?  I feel that I may have fudged it until the point of no return and plans to buy just a whole new router to hopefully solve the problem.

I found the problem.  Apparently my rental computer does not work well with WPA 2 connections, but when I set to WPA it worked like a charm.  Thanks a lot for the suggestion anyway!

Tags: Linksys Routers

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