Have you tested your hardware ? HDD or SSD not broken ? RAM not broken ?
RAM you could run memtest and see if it gives any error, for HDD you have couple of different ways to test, but i always unplug it, and test it external on an other pc with hdsentinal, some people will tell you even if its at 98% its still good, but even then it could be better to replace it.
If you have an other HDD somewhere just test if it works with that one.