Can't get the wireless to work on a HP Pav...

The owner reloaded his Windows Vista on this machine and now the wireless doesn't work. I have it online (wired of course) and have downloaded all the patches and drivers I can find but it still won't attempt to connect. I am not sure which way the switch on the front should be set but no matter what I try I can never get a signal. The machine says ''this computer does not have a wireless network adapter installed and configured'' I know it has built-in wireless and I have loaded the drivers and device manager does not show any issues...