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delete the WTF & WDB folder, they should re-create themselves when u launch the client again.
make sure you don't have addons who counter eachother and that you increase the script memory for addons to 999 since when addons fight or when more memory is used than allocated it will cause the client to shut down.
if this still does not work then i would suggest downloading a new client in case the one you have is defective.