System suddenly lost all configurations

My computer simply turned back to its "original " configuration. Suddenly it was just like i just had taken it out of the box.... Lost some software and all the configurations including mail settings, passwords etc. Files are preserved. What happened? Any clues?
Thanks
Marcus

Hi Adrian,
Thanks for the response.
I checked the link you provided. The home directory is still present and contains the apropriate short name ("Marcus"). So this was not the cause of the event.
It actually didn't cause me a lot of trouble. My files are ok, but I had to reinstall some small applications (such as the portuguese keyboard configuration for mac). I lost my stickies information too.
But it is very intriguing.... I was wondering if this can happen again and how to avoid it.

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