Photoshop CS4 - Converting bit depth on import

Photoshop seems to be converting pictures that I open to 8-bit from 24-bit: before the problem I think it was converting to 16-bit because Photoshop doesnt seem to support 24-bit but I cant remember.
I've been using Photoshop CS4 for about 4-5 weeks now without any problems and this just seems to have come out nowhere. The problem doesn't seem to be related to Camera Raw at all because I don't use it to import my pictures, so the "Workflow Options" don't seem to have any effect on the converting. I've also tried to delete the preferences file and that doesn't help either.
Any ideas?

Photoshop doesn't convert bit depths or color modes when opening documents, unless there is an unsupported bit depth (like 12 bits/channel) in which case we convert upward (to 16 bits/channel).
It would help if you told us what file format you were talking about, and what you mean by "24 bit".

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http://www.ccleaner.com/

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All I can say is... Boy am I glad I have an ATI card that just works (and that's including Photoshop CS4/CS5 32/64 bit)!
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>

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Hello,
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Photoshop CS4 - Converting bit depth on import

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