Wireless. I have had my acer extensa 5220 since november and it has been working fine with the

Question

I have had my acer extensa 5220 since november and it has been working fine with the wireless i have connected in my house and with other peoples wireless routers but recently i found that it has stopped connecting altogether and when i attempt to search for any routers it isnt finding any, like im in the middle of nowhere! This isnt only happening in my house but wherever i take it which makes me think it has something to do with the laptop it's self. Unfortunatly i know nothing about fixing laptops and so need some help...any advice would be great
liz x