Network wont connect

Hello,
I think I messed up my own connectability. I wanted to put a password on my wireless router, since I didnt do it when I set up my network. I ran the software, plugged in the info and everything was fine. today I realized my wireless printer would not scan a document to my computer (the desktop that is connected to the modem), so I tried fixing that. I cannot for the life of me find my software for my printer, but now I cant get any of my laptops to connect to my router connection. The troubleshooter is telling me my password is not correct. I printed out the info when the router prompted me to, saved the settings and all...but the info is not correct evidentally. Does anyone have any ideas on how I can fix this? Im sure its simple, but I am missing something :)
thanks in advance,
Hopeless Button Pusher