Hi and thanks for posting. I found the correct folder in registry, but sadly it does not contain "ScanningWhenAssociated" I simply created the dword string and set it to 0, and I still get spikes when looking at wireless networks (clicking on the symbol buttom right). At least now I know why the spikes comes sometime.
The spikes however are not my biggest problem ATM. The biggest problem is the dropouts where I (in worst cases) have to wait 30-60 seconds before connection to my AP gets back, while other devices works perfectly fine. Usually the connection to AP get's back in 5 seconds +- couple of seconds.
I see that you also have Intel 7260, could you check if the dword is in the registry on your computer? Also, which OS are you running on?