Not sure what the problem could be. Have just downloaded, unpacked, opened the ViewSwitchingNavigation QuickStart on two different machines and it opens builds and runs fine without modification.
Only thing I can think of is if something did not complete unpacking for you or you placed it somewhere where you don't have full access permissions for the file system weird things like this could happen.
Only thing I can think of is if something did not complete unpacking for you or you placed it somewhere where you don't have full access permissions for the file system weird things like this could happen.