Turn of your phone and remove the battery for 10 minutes. The reinsert the battery and deploy the HARD RESET ( Check HTC Viva Manual how to do hard reset). Also you may try to clear storage in the settings. BY doing this your device will reset to orginal factory settings.... BE SURE TO BACK UP YOUR DEVICE before starting this... you can use SPRITE BACK UP also available on the HTC website.. download both device and PC software ... take back on PC for easy restore.
Good Luck..
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