I recommend that you first test your memory with Memtest86+ but you should always test a second time with a different memory testing tool just to be sure. Windows Memory Diagnostic should be that second tool.
Thanks for your reply FreeBooter, as I mentioned the system is operational, no errors, no nothing, everything’s working fine only the windows memory diagnostic tool is failing and I just want to wonder why?
I've copied the last two posts to your original thread and have moved it back to the Windows 7 forum. Please do not create duplicate threads since it can get rather confusing and create unnecessary clutter. Please stick to the original thread going forward.