Files being corrupted - why?

I have discovered six .jpg files (that I know were fine) unviewable - when I attempted to examined them in Adobe Photoshop I now get an error saying "unknown or invalid JPEG marker type" - these files were definitely being displayed ok last week and nothing has been done to them.
I then went to view an html document I had created in Adobe GoLive last week (again a document I know was displaying without a problem). It now contains text such as "Ã±·×º2s4äE4sTÎJ-DÉ..." anon rather than the html it once contained.
Does anyone know why these files have become corrupt and how I can prevent it from happening again. If someone also knows how to reclaim the contents of that html file I would be extremely grateful.
Many thanks,
Ian Livingstone.
1.5GHz PowerPC G4 Mac OS X (10.4.6)
1.5GHz PowerPC G4 Mac OS X (10.4.6)

Thanks for the advise. I ran Disk Utility and it failed to verify the disk, finding orphaned nodes which I assume were my lost files. I repaired the disk and it is now verifying fine.
Do you know if there is a way to prevent this happening again or is this a hint of things to come? Can I expect to loose more files anywhere on the disk at any time? Very concerning.
Thanks once again for the heads up.
Ian.

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Please mark "Solved" the answer that really solve the problem, to help others with a similar problem.

Files being corrupted - why?

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