Why windows 7 autoplay not working?

There could be three reasons for non functioning of the auto play function in windows 7.Either autoplay service is restricted by group policy or it is cancelled by some currently running programme or the service required by autoplay to function is not running.if it as been restricted by your network administrator through group policy you need to contact him to get it activated.If it has been canceled by some already running programme please close that programme.You can try these step to rectify your problem.First click on start button go to accessories then right click on command prompt and run as administrator then type" net start shellhwdetection" then restart your computer it should work.If this also doesn't help you can try checking your group policy settings remember this is applicable only for windows 7 ultimate. Click on Start button and in the search field, type gpedit.msc and press Enter. Now find and go to Computer Configuration >Administrative Templates> Windows Components>Autoplay Policies>Turn off Autoplay.

To Enable the autoplay function