Going to be honest, this one is an absolute mystery.
If / is working /ghost/ should also be working - they’re served the same way on the same domain, so I don’t understand why one is throwing a domain error.
Can you share some more information about exactly how you installed Ghost? Maybe there’s a clue somewhere…
@royAB can you provide the contents of your config.development.json file? You should find it in the folder where you installed Ghost, should be C:>users>DELL>ghost based on your last comment.