Issue on playing MP4 on VLC 2.0.3

I need help on VLC 2.0.3 on my 64-bit PC. I cannot play any 1080 MP4 but I can do that on older versions such as 2.0. So I decided to just go back to the lower version 1.9. But each time I try, the player is still showing version 2.0.3 even though I use an installer for version 1.9. By the way, I am using a sony VGN 150 dual processor laptop and a dual monitor.
Can anybody help me on this?
