As you are synching over wireless network and the fact that two different operating systems are involved, it is best that the logon accounts to be identical. Also you need to be able to access each folder from the other station. I suggest you share the two folders and allow full access (read,write) to both shared locations. Open windows explorer on the windows 7 PC and click tools/map network drive. Check the box for "connect using different credentials" and type the user ID and the password of the other dhared folder and eventually type the shared location address such as \\vista\shared name..
This way you will have ampped drive such as Z drive. Launch the synch toy and configure the synch operation.
Hope that helps
Binah