How do ireinstall my whatsapp

What Can Send Receive WhatsApp Messages
-Check whether router is working or change to another network

-Turn on and off airplane mode
-Use mobile data rather than wifi
-Reset network settings
-Restart device
-Reinstall whatsapp
-Reset device to factory settings

Try clearing the cache and data stored by WhatsApp by heading over to the application manager.
Uninstall and reinstall

-Try another device and install whatsapp on it
-Try to send media
-If yes, send APK file on LG device via Bluetooth
-Install that APK on your device

uninstall whatsapp and get a good virus detector like norton or macaffee,you have a virus.

try going to your app store .. and dlt your whatsapp and reinstall it..
or you can go to whatsapp and go to options and if their is an upgrade avaible it wil say upgrade to whatever version and click upgrade now .. (:

they should try to delete whatsapp and reinstall it ...

That's a common problem when upgrading Blackberry, the easiest option is to uninstall Whatsapp, download and reinstall it following this procedure (depending on your model):
Whatsapp for BLACKBERRY 9220 9300 9320 9900

This Whatsapp website might be helpful
WhatsApp FAQ How do reinstall WhatsApp

You don't>>>> If you had to re-install your O.S.,then all data was over-written.