You need to make sure that the Shell Hardware detection is enabled - it could have become disabled as a result of an update. To do this:-
Start - Type “service.msc” in Search to access the Services console. Locate Shell Hardware Detection, and ensure that the “Service Status” is Running, and “Startup Type” is Automatic. If not, start the service and change the Startup Type setting accordingly.
If this doesn't help -
You may find this autoplay repair wizard helps.