Wireless Adapter not working under Vista. I have performed a clean install of Windows Vista

Question

I have performed a clean install of Windows Vista Business on my Acer 5044 WLMi. Everything works ok apart from the wireless adapter. The driver is loaded correctly and working however the radio button does not light up and there is no software facility to enable it. I have downloaded and installed all of the necessary vista updates from the Acer website to no avail. The wireless adapter refuses to initialise and detect any networks.Fortunately I took a back up of the XP installation and when this is restored the wireless adapter works fine.The Laptop is an Acer Aspire 5044 WLMi (Couldn't find it in your pick list!!)Any ideas??Oblong button doesn't work and we are running xp. Didn't have to do anything before I upgraded the Belkin router.