If RAM memory in your computer is damaged, it can cause such kind of errors. Checking RAM is quite simple. You only need to download the free software memtest, burn the ISo on a CD disc, or alternatively get the EXE file for an USB pendrive (if your computer allow to boot from an USB device), then boot the computer from the CD (or the USB device) and let the test run. It require some time to complete at least a single pass (around 40 min if I remember correctly).
If errors are found, then you need to replace RAM