Actually, I forgot to say, check for a Video Memory error. You use the Video Tests for that program, and if your system freezes up during the Windowed 3D test, you may have a bad stick of ram on your Video Card. That happened to me with my old Dell Laptop. the Video was Dedicated and nothing I could do to fix it.
If this happens on a PC, you can just swap out your Video Card, but on a laptop, your laptop is doomed.
But if you ran ALL of the tests and it didn't freeze up and you got THAT score which is better than the 820 I got last time I used it, then there is nothing wrong with either your Ram or your Video ram. It was just a stab in the dark.
With a score like that, your hardware is in good shape so I would try an In Place Install first - You can use something like Aida64 to pull your License Key out, I don't think Speccy will give you your full Windows Key. there used to be a Program called Everest Home, but they stopped making the free version, I think that became Aida64, check for a free version of it.