Hi. You could be having corrupt system apps. As for the Whatsapp messenger, download the .apk (installation file) as per the steps here http://satechhelp.co.za/1611/Install-Whatspp-Messenger-Android-Without-Adding-Email from another phone, and then send it over to your phone via Bluetooth. The locate in you files withing the Bluetooth folder and tap it to install.
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