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The colors on my laptop change at night, this happens without any specific action I take. While I'm using the computer, at a certain hour, the colors just change a bit.

A friend once told me about a software that does this - changes from "warm" to "cold" colors by time of day. I suspect that he/someone installed this on my computer. I want it off my computer!

What should I look for, and subsequently remove from my computer?

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Why don't you talk to your friend? – GreenMatt Nov 8 '10 at 21:33
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One software which does that is F.lux - check if this is running, uninstall if it is.

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Many monitors have an "ambient light sensor" that adjusts the brightness to compensate for changes in the room lighting. Try covering the sensor on your machine for a few days to rule this out.

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That was my first thought, but the fact it happens "at a certain hour" sounds like it might be a system things rather than hardware. If the asker was correct in that. – peachykeen Nov 8 '10 at 22:22
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If it's the hour where the sun goes down and you turn on the room lights or a desk lamp then this would be a good reason. If it's on-the-hour then not likely. – Chris Nava Nov 8 '10 at 22:38
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