Windows 7: Connecting Homegroups Win 7 and Win Vista for file sharing

Hi.
My First post. We have a new HP lap top running Win 7 64 bit, A new Lenovo Think Centre running Win 7 32 Bit, connected wirelessly to my router. Have set up a Homegroup between these two computers and they work OK, My problem, my older PC running Win Vista 64 bit is connected to the same Netcom NB6 plus 4w adsl2 router via a wired connection, this PC has files I would like to share with the new windows 7 computers. I have tried to follow the set up proceedures although they do not seem to work the way the Computers are connected to the router . Will I be able to set this system to work . Thanks

Here is some good info.

Networking home computers running different versions of Windows
Join or create a workgroup
Windows 7 Network Set-up - For Dummies

Even with all Windows 7 computers in my house, I still skip the Homegroup method and just network any of them together the proper, old-fashioned way of drive paths, shared folders, etc. The trick I've found is to have the same username and password on all systems, and then it works very easily. When you learn to do it this way, it doesn't matter what version of Windows each computer runs.