Macbook Shuts Down During Video Playback

My computer has begun to shut down unexpectedly when I am watching a movie. I watch about 20-30 mins of a show/movie/other video and my computer will shut down completely, whether it is plugged in or not. My computer is an early 2008 macbook, 4.1, running osx lion. My battery condition is "replace soon" and my fan has gotten quite loud over the past year or so. Any ideas on how I might fix this problem? New Battery? New charger? Internatal cleaning?
Thank you very much to everyone.

Hello,
I am having this very same issue. It shuts down during startup. I can boot into Windows, and using the Leopard startup disc, Disk Utility could not work any magic. I do not have a second Mac or access to one for any backup purposes. I have no idea what else to try, does anyone know something besides backing up through firewire, on how I can either save my computer's data or resurrect the drive? Thank you for your help.

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