Not connecting to wifi! HELP

[epiczacktime]

Recently my wifi has been acting up (by recently I mean like...9999999 weeks now) on my windows 7 when I try to connect to my wifi it either says "The key or passphrase is incorrect" or "windows can not connect to the Internet" ( something like that) But it doesn't make sense! Because the Internet password is correct! And also all other devices connect but the windows seven! But to make matters worse and also weird is that when I say windows seven I mean my windows 7 PC! The windows seven laptop is connecting perfectly! Also did I forget to say that the Internet I got is new!

 

[Harrie-S]

Just to get the posts together.
http://forums.windowscentral.com/ask-question/357480-cant-connect-wifi-help.html