purely by coinsedence, I too had to reinstall the Glass Deck Software on my computer because I reinstalled Windows. I still had the old folder "Program Files" (on your computer "programme") on the second hard disk but after starting from that folder gfd.exe I had black screens just like you.
So I think that you simply copied your existing glassdecksoftware onto your new computer. That doens't work. First you must rename the existing "Glass Flight Deck" folder to something else and then install a fresh copy of glassdecksoftware on your new computer. To do so you need to download gfdsetup.exe from your flight deck software account. After that you can either copy your license into that new "Glass Flight Deck" folder + your existing gfd.xml + your navdata either rename the new "Glass Deck Folder" into anything and restore the name of your old renamed Glass Flight Deck folder.
I kept the new folder and use the old renamed Glass Flight Deck as backup.
That works and I tested your gfd.xml. The gauges show up but you still have fine tuning to do
. Your graphics card has nothing to do with, don't buy a new one.