We have a desktop pc at home running Windows 7 and my brother has a laptop pc running Windows Vista. I read in the documentation about networking in the Windows 7 Homegroup or Networking that such pcs can connect eventhough they have different operating systems (Windows 7 and Windows Vista). On my brother's laptop running Vista, seems like there's no problem since on his end the files on the desktop pc can be accessed however on the desktop pc's end running Windows 7, I can only access the Public folder but not his User folder where all his files are stored. Everytime I clicked that User folder, a prompt appears warning me that I need permission to access the files on this folder. Is there anything else that I should do and it is on the desktop pc's end or on the laptop's end?