1.Connect your mobile with your pc via USB cable.
2.Go to folder named whatsapp/Databases
Two files are there named msgstore-yyyy..dd..db.crypt and msgstore.db.crypt
msgstore-yyyy..dd..db.crypt file contains all the messages sent or recieved in last 7 days.
Open it with notepad or wordpad to view and read messages.
Use this it's easy and hassle free.