No need to diagnose anything: Your hard drive is dying!!!
You must BACK IT UP NOW.
If you can't back it up turn off your PC NOW!!!!
Essentially every time you turn it on there is a chance it will die forever. The next time it is used MUST be to remove the data you need (if it's not too late already)...
To back it up you will need a second hard drive. If you have one turn off your pc, put it in, reboot, then transfer all your data to it. If you don't have one you need to buy one because your current drive will die any moment.
If you're really really scared of what's inside you will need a friend who isn't or you will need to take your pc to a shop and get them to do it.
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<b>Calculate the probability of culture flips: Flip Calc</b>
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