What is going on with my computer?

This is my work computer. Windows XP. Microsoft Word 03 until about a month ago. Now it's been updated.

Back in February, I was working on PowerPoints. I had a process where I would create and save them and go back, edit as necessary and save again.

Here's where things get wonky: one of the PowerPoints (out of 20) didn't transfer well. When the file was copied dierctly over to a new folder, it reverted to an older version.

Same things have happened with my Word, though it won't save over an existing document of the same name.

Now it's happened in my InDesign (C3). A project I was working on saved without me pressing save. I know this - I didn't want to press save. I didn't.

This is really making me look bad at this point. No one can seem to figure it out. No viruses on the computer either.

The thing that is REALLY confusing is that it's not every time I save. I can save something today and it'll be fine, but tomorrow it won't save completely.

Any ideas?

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