memory diagnostic: problem found

MTV0101

Honorable
Jul 2, 2013
2
0
10,510
when i want to extract RAR (big ones) i get an error
i asked the community they said that it might be a memory problem so i tested it via windows memory diagnostic i got a error in the extend mode that says the hardware has a problem.
so i had my PC tested by computer store and they said there is no problem. is that a problem with my computer memory or didn't they test it appropriately?
 

MTV0101

Honorable
Jul 2, 2013
2
0
10,510

i tested with windows memory diagnostic in bot menu i also have win 7
could it be another problem which is not related to memory
i also discovered this problem when i changed PC's RAM