Unknown files taking up MASSIVE amount of storage

Hello to all,
     And thnks for any help in advance. Ever since I upgraded my '09 model MacBook Pro from snow leopard to lion I have been experiencing unaccessible files taking up a tremendous amount of space on my computer. I have no idea how to access these files, nor do I have any idea as how to get rid of them. For starters, I know for a fact I don't have 30gb of movies and moreover I can't figure out I have almost 50gb of "other" files taking up that much space. I was going to reinstall snow leopard but have been unable to find the disc. Has anyone out there had this happen to them? How do you fix this? It is really slowing down my computer and I would like to get rid of this stuff thats draining it's performance...
         Thanks to all!!!!

I've never experienced OS files (Mac and PC) taking up that much space. And I don't have that many programs on here.

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