Connecting Win 7 to Win Vista for File Sharing

I have a New Lenvono Thinkcentre and a new HP Pavilion laptop both running win 7 and conected wirelessly to my router. Have set up Homegroup on both new computers and it is working ok . I also have a older PC running Vista conected to the same router via a cable not wireless this has a lot of Photos and Video that I would like to access. I have tried to connect the two new computers to the Vista no luck. Would anyone know how I can connect to the vista computer . I started following ( How do I ) Make Windows & HomeGroup content accessable to Vista and XP? then realised that all machines would need to be wirelessly conected I would think. Can someone help Thank You