WRT54G wireless network gone totally wacky! please help.

I called linksys tech support and they were of absolutely no help. the wireless network was working fine until about an hour ago when my roomate connected her computer to the network. the network was previously configured through windows...but when she connected her computer she connected through her linksys wireless card (which i don't have on my computer.) Somehow in doing this she reconfigured the entire network...entirely new name etc. Now my computer can't connect to the network...I can see it on my list of wireless networks, but the password I was using previously to connect is not working. I get the error message "The network password needs to be 128 bits or 256 bits depending on your network configuration. This can be entered as 8 to 63 ascii characters or 64 hexadecimal characters" I have no idea what that even means. How do I get my original network back so I can reconnect my computer?!

Its doubtful that just by connecting to your router, your roommate caused this problem with your router.
What version of the router do you have?  Some of the WRT54G routers have an SES (Secure Easy Setup) button.  If you push that button accidentally, you will reset your wireless security to a new password.
Were you using wireless security?  If so, which type?  WEP, WPA, or WPA2?
Did you give your router a unique SSID, or are you still using "linksys".  If you are using "linksys", are you sure you are trying to connect to your own network, and not your neighbor's network?  Did the SSID of your router change from what you set it to before?
To correct your problem, point your browser to 192.168.1.1 and login to your router with your user name (if any), and password.  Then go to the "Wireless" tab, "Basic setup" subtab, and correct any entries that are wrong.
Then go to the "Security" tab, "Wireless Security" subtab, and correct any entries that are wrong.
Reboot entire system.

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