How to change channel in Vista

I have a Linksys WRT 54 GL router, I must have changed the channel to

6 now my ASUS laptop running Vista cant't connect but my macbook can. I have looked for a way to change the channel number in the ASUS but I can't it was working fine until I made changes to the router. BTW the router is connected to a win xp desktop. Thanks for any help.
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