Ask Jack: How do I get permission to copy files between Windows PCs?

Maurice gets a message saying he is not authorised to open files he has copied from one computer running Windows to anotherI have tried to copy files from my old computer running Microsoft Windows 7 to my new one running Windows 8. When I try to open the files, I get a message telling me that I am not authorised to open them. MauriceWhen you use a Windows PC, you do it via your user account. This “owns” all the files you create, and lets you set permissions for sharing them (or not). This is