Hello and Welcome to FixYa!
I seems that your phone's firmware is damaged. I'll recommend you to update your phones firmware.
To do so, you need to have the USB data cable of your phone. If you have it, kindly navigate to
this link, download, install and run the application. Follow the instructions to update your phones firmware.
NOTE: Your phone will be as in "Out of the Box Condition" All data will be loss, so better move it to memory card and remove it before updating.
If you have any Confusion, questions or issues regarding your problem do tell me.
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Concerned, Nooh