Laptop shuts down randomly and booting x200 harder

[signorigianmario]

This morning i wanted to play CS GO, Monday my laptop being supposed to be cleaned and the thermoconducting liquid (idk how to spell it in English, it s the solution that keeps the CPU cool). I have seen that the CPU temperature was 100 degrees Celsius (i5 430M), extremely hot,in spite of having a cooling pad. The laptop suddenly shutted down and when I tried to turn it back on (I was sure the temperature was the reason of shutting down and I let the laptop to cool down) and it seemed that Windows 8.1 Pro loads x200 harder (probably some bad sectors were created). I want to say that I tried to ''Repair this computer '' from Windows 7 Home Premium bootable media (USB Stick), but I waited 3 hours on Setup is starting displayed on the screen.
What should I do?

 

[signorigianmario]

I am adding 2 things: I have 2 OS installed and I dont know where did my restore points dissapear, because on 3rd July i made a restore point.

 

[signorigianmario]

P. S. I finaly turned on the Task Manager and it shows that the HDD is used 100%,but the reading and the writting speed is 0Mbps,both of them. Should I format every partition?