However, now it has everything to do with the Hotkey Driver and Utility. After uninstalling SP3 and thus going back to SP2 it worked again.
Anybody an idea of what might be causing this? And, how to solve it? Remarkebly, I had the same problem with this laptop and this wireless adapter when I installed XP SP3 long time ago. In the device manager it says 'working properly' and it has the newest driver where it worked on before. When I switch it on the small led does not light up, also now the hotkeys work a small pop up window shows the same picture as when I turn it off (the red cross in the picture of the pop up). When I go to wireless adapters in the control panel the Atheros 7500eg shows enabled ( i tried disabling and enabling again but no effect), but it finds no wireless networks. The hotkeys work, but I rather have my wireless adapter back. I uninstalled the ACPI/ATK0100, which left me with an unknown device in the device manager - it seems Windows is not able to install it automatically as it did with clean install of Windows 7.
Also I updated the driver for Atheros 7500eg but no result. I tried to restore the system to an earlier point but it didn't help. I installed the Hotkey driver and Utility (made for Vista) on my Windows 7 and after that my wireless stopt working. Hello, I have some problems with my wireless adapter (Atheros 5700eg) on my Toshiba Sattelite L40-12K.