If you think the memory in the computer is bad or not properly working.
Memtest86 is the RAM test program to use.
To check memory download and burn a bootable CD or USB flash drive of Memtest86.
http://www.memtest.org/#downiso
This is the archive for Memtest86 versions:
https://www.memtest.org/archives
WARNING:
Be careful what you click on to download Memtest86.
That web site has adds that have downloads for different programs.
You have to look closely to find the actual Memtest86 download.
