My MacBook keeps restarting - what could be wrong?

I have a MacBook 1.1 (Intel Core Duo) running OS X 10.4.11.
Over the last few days my laptop has been restarting itself for no apparent reason while I am working. This happens both when I am online and offline. This morning, instead of simply restarting, it suddenly showed me a black box with a warning in several languages telling me that I had to restart, which I did.
I have verified my disk and repaired disc permissions using Disc Utility - nothing seems to be wrong. And so far as I can know I have not done anything strange to the computer lately. What could be wrong, please? After the restarts the system functions quite normally for several hours - until the next restart!

I'm having the exact same problem since installing the new security, itunes, and quicktime updates too! My computer has me restart it at least once a day if not more ever since I installed them. I'm always only using like Firefox, iPhoto, iTunes, etc. Nothing major. Today my computer wouldn't start at all. I had to renew the PRAM or whatever it's called just to get it to come on, and it has since made me restart twice.

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My MacBook keeps restarting - what could be wrong?

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