BIG DISASTER! I DON'T KNOW WHAT HAPPENED TO MY COMPUTER! PLEASE HELP

Power G4   Mac OS X (10.2.x)   Right now it has reverted back to 10.2.8, but it was updated to 10.4 something..
I have a major problem. I have an essay that I need to work on but my computer is acting all strange. A while ago my family decided to split up into accounts instead of just having one for all of us. Everything was going fine until this morning when no one was around, the computer must have fallen asleep. When we tried clicking around on the mouse nothing was happening, the screen was still black, but the computer was still on... So we decided to restart it by pressing the power button. When the computer started up, it had reverted back to the old state, when we only had one account for all of us. Right now it thinks it is version 10.2.8, but we installed Tiger a few months ago. This has happened before (that the computer goes back to the original state) and I believe all we did was restart it, then everything was normal again. I've done that quite a number of times and still no change - I can't access that essay or get the computer to be normal. If anyone has any advice or solution to this problem I would so greatly appreciate the help!
Power G4   Mac OS X (10.2.x)   Right now it has reverted back to 10.2.8, but it was updated to 10.4 something..

HI Maria And Barry..
I've got the Tiger No Shutdown problem
My System Prefs unexpectedly closed when I selected startup disk
system profiler, disc utility and such are failing
Did you upgrade from a boxed retail Tiger, Maria?

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