How do i return a sony vaio laptop i bought 2 months ago from officemax?

I have a sony vaio laptop i bought 2 months ago from office max, for some reson unknown to me, 1 usb port, and the audio stoped working, how can i get it exchanged or get my money back?|||most stores have a return policy and it is just a few days after that it is your but they should repair it for you.