wireless internet problems with windows 7

Took my new laptop home last night and attempted to connect via my wireless router…don’t really know what I may have done but i was given a password and it connected me….then the issues…my wife and children could no longer log in to the internet via the wireless router like they had previously. We had never password protected the router since we are in a very rural setting and saw no real need. Now it is asking them to use a password to logon….how can I undo what I’m assuming windows 7 did to my router setting?