You first need to ensure that the account that you are running VS with has write access to the folder.
Here I added an E drive to my VM and granted everyone full control.
I recommend that you create a home folder to store all of your VS projects. Use the Windows explorer to create a D:\MyProjects folder. Check the security permissions and verify that your account has full control.
If you are building your first application, you will probably not have multiple projects within a solution. If that's the case, the check the "Place solution and project in the same directory". That way everything should be places in D:\MyProjects\App1.