Cant turn off computer

Hi,
I just upgraded from 10.3.9 to 10.4.3 and since then I cant get my computer to turn off. I press the "shut down" or "restart" option and it takes forever, it never turns off, I've left it there for like 20 min and nothing!!! the only way to turn it off is by holding the power button for a few seconds.
Can anybody please help me please
Thanks...

I tried putting my computer to sleep, and it goes to sleep and wakes up with no problem. I deleted the file, but I still have the same problem.
I also forgot to mention that my computer wont shut off even when i just turned it on, opened no programs, and try to shut it down.
Also, when all my desktop's icons dissapear after pressin shut down or restart, the arrow of the mouse appears there, no circle (as if trying to close some program), i can move the arrow everywhere, i tryed pressing commandoptionesc but it doesnt open any window.The comp just wont turn off
=(

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