David can't highlight text in Excel or Word when he's in remote desktop with his Mac to his 64-bit Windows PC. Leo says that there may be an issue with the functions in remote desktop and he can verify that by trying with another PC. The Mac isn't using any resources, it's just a window. So there's something wrong with the 64-bit Windows PC that David's trying to access. Leo says that there's possibly bad rendering going on with Windows Remote Desktop. Alternatively, install Office for the Mac.