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#21
Since your system is 10 years old, it's probably not UEFI. As a result, you should use memtest86 v4 from here-
MemTest86 - Download now!
Get it by clicking on "image for creating a bootable USB drive.
When you boot it, click on Configure and then select RAM.
As an option, you could use the Windows Memory Diagnostic.
In Safe Mode, click on Start and type Memory in the Search box. It should cause WMD to come up. Elect to reboot your computer and it will run checks immediately.