as others have stated it COULD be the Dimm slot you are using to test
Try ONE stick in the furthest Dimm slot from the CPU then test
If it errors try the next Dimm slot and so on and so forth
Also have you tried using the two mem sticks as they were Before you got the new ram and see if you have the same issue?
One last thing Sometimes windows will pick up a config change in hardware and need re activation,
Good luck and hope you get it sorted
Try ONE stick in the furthest Dimm slot from the CPU then test
If it errors try the next Dimm slot and so on and so forth
Also have you tried using the two mem sticks as they were Before you got the new ram and see if you have the same issue?
One last thing Sometimes windows will pick up a config change in hardware and need re activation,
Good luck and hope you get it sorted