DESCRIPTION:
My desktop computer has been buggy for a long time, and I didn't know if it was a problem with my RAM, video cards, operating system, power supply, etc. Luckily the first thing I checked was my RAM, and I found the problem.

Download Memtest86 for free here: http://www.memtest86.com/download.htm

I used the USB key version (it creates a bootable USB key to test your RAM). Worked great - I highly recommend it. To do a full 4-pass scan on 16GB of memory, the entire test takes about SIX HOURS. After getting the new stick, my system passed with zero errors.