Acer extensa 4220 wireless problem. I have Acer Extensa 4220 Laptop with the following

Question

I have Acer Extensa 4220 Laptop with the following specifications:2.1 gh processor /1 cash2 g ram385 vga14 inch wide screen160 hddwebcami tried many versions of windows but i couldn't make the wirless work, it's small lamp doesn't even give any light i tried many versions of xp and vista but the same problem remains can anybody help me