Account resarted?

Okay here's the deal

Yesterday I closed my portable PC like every other day. When I starte
it today, it says preparing your desktop. When vista opened my accoun
was restarted to default as if I just created it. I go in my document t
find out they are gone. So I do a search of some files that were in m
document to see if they were deleted. Well they are not and the path i
exactly the one leading to my document

Right I'm kind of confused. My account as resetted to default. M
document are not gone but their path is still good even if I don't se
them in my document.

Any ideal what happened

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hellite