Internet connection with Sony VAIO VGN-FS115B

I have a Sony VAIO VGN-FS115B using an Intel(R)PPRO/wireless 2200BG network connection driver.

My problem is that I cannot connect to the internet using wireless although it has been working OK up until recently.

The 'wireless network' shows that I am 'connected' and with strong signal strength.

Device manager tells me that my driver (see above) is 'working correctly' and that there 'nothing better' when I requested an update.

I can get onto the internet using an ethernet cable connection.

Another laptop is able to use the wireless internet using the same modem/router as mine so I think I can discount that as a possible cause of the problem.

I would appreciate your help in sorting this out please
Kind regards

Len, in Melbourne