Wireless no longer connects

Hello,
I have a toshiba laptop A660. It has always run internet wirelessly and now for some reason it wont do it. I have tried reinstalling my aol and originally it said there was a problem contacting the modem and that the router was not detected. I have now used a yellow ethernet cable and have got my internet connection but it wont allow me to go wireless. I have a wireless light lit up (looks like a little pylon type thing with radio waves emitting) on top of my screen so i think that thats ok. aol easy installer tells me that it hasnt been able to find a wireless adaptor but when i click on the picture of a laptop it changes that to wireless adaptor found and updated. then still tells me a problem - any suggestions - plese in easy terms as i'm not techncially minded