how should i need to do keyboard not working in mac

Last Saturday I opened my macbook but I cannot used keyboard and other social network as well. I was tried to take off battery and restarted again and again but I cannot used keyboard till date. One more thing my Itunes also out off date. I didn't used that macbook since last year. Please help me to find solution. Thanks.

Regards

Ei Thin Zar Oo