mbp 13", lion 10.7.4 >> wifi can't find any networks

i've got macbookpro 13" core i7 for a year . about 2 days ago the wifi cant find any networks, i installed win7 on my mac already & wifi still working good but on mac os lion 10.7.0 can't find anything. when turn mac on , in the first time finds networks but can't join (a connection timeout occurred) after this message can't find anything . i tried to reset the SMC, PRAM,NVRAM & update my OSx to 10.7.4 & remove the contents of Library > Prefrences but those aren't effective. im so disappointed ( && router works correctly) .... 😟(((( Please Help....