Which operative are you running on your pc?
Do you have admin rights on the computer you are using?
It could be a faulty download or install. Maybe try to download and install again, but uninstall the current version first - and reboot.
If that doesn't work, try running VSD as an admin (right-click on the icon and choose run as admin).
BTW, I hope you are aware that Visual Site Designer (VSD) is a different programme from Responsive Site Designer (RSD), which is the one mentioned earlier in the other thread you posted in. If you want to have a responsive website that can be viewed on all sorts of screen sizes, I'd go for the latter.
Ha en riktig god dag!
This site was made before we were able to create components through the app:
Component sharing for RFF, RBB, RSD and SD: https://eikweb.com/sharing/
My work in progress right now:
Components for the same as above + HTML Editor: https://mock-up.coffeecup.com