FSX Scenery problems

Hi Folks, 

I joined the forum as I am totally lost as to how I can resolve scenery problems in FSX.

I have been using FSX for over 10 years without too many issues. But recently I upgraded my PC and it came with Win 10, since then I have had a catalogue of problems (which I have managed to resolve) except for this new issue . I have some images but can't post them as I'm new (I think). The issue is that I get lines, 'walls' and various other shapes appearing soon after take off and occasionally on the ground. This happens the most when I am using a separate 'spot' window on my 2nd monitor, but I've also tested it on just one monitor and it still happens.

From what I have read on various posts, people suggest that it could be to do with my graphics card - I'm using:

GeForce GTX 1060 6 GB card with a 

i7-8700K CPU @ 3.70Ghz and

8GB RAM

Win 10 

Any help or suggestions will be hugely appreciated and I can send images if needed. 

Cheers

Sham