Lumia 720 ,hanging problem

From two days i am suffering from this problem. My mobile is hanging ,it don't work ,i can't open any apps without my contacts ,music folder .i can't open setting also after that,i have to restart my phone but my all phone keys work after this problem.Please help me...

Hello, manwinder.
How did you perform the restart? Is it by pressing and holding the Power and Volume down keys simultaneously for 10-15 seconds? If yes and didn't fix the issue, the next troubleshooting is to reset your phone. By the way, what do you mean by "i have to restart my phone but my all phone keys work after this problem"? If in any case that what you mean is that your phone's hardware keys are not working (Camera, Power/Lock, Volume down/up keys), here's the alternative way to do the reset: 
Please make sure that the battery level is more than 50%. If not, charge your phone first for at least 20 minutes.
Switch off your phone and then disconnect the charger.
Press and hold the Volume down key, and connect the charger. Wait for an exclamation mark shown on the screen.
Press the keys in the following order: Volume up, Volume down, Power and Volume down keys. A rotating gear will show on the screen that indicates that your phone is resetting. This may take several minutes.
You may verify the provided steps here: http://www.nokia.com/au-en/support/product/lumia720/troubleshooter/?categories=Other,Unresponsive&sh... .
Note that all personal content on the phone will be deleted and factory settings will be restored. We suggest you to back up your files before doing the reset. To know more about how doing it, refer to this link: http://www.windowsphone.com/en-US/How-to/wp8/basics/back-up-my-stuff . 
Do not hesitate to inform us about the outcome. Cheers for now. 

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    Taping on status bar is also not working for me but it is also not working.
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