Backup Connection Error

I have been trying to solve the same problem as others on this (and other) threads for some time. I am trying to set an automatic backup from a Windows 7 source to Ready NAS Ultra 2. I have tried all of the suggestions I can find including:
1. Checking Workgroup is the same on both machines,
2. Setting up another user with its own password and setting sharing permissions in some test folders.
3. Setting up a specific user for the NAS with its own password.
4. Opening sharing of folders I want to share and those in the test/guest account to 'everyone' and the special NAS account. These folders are all available to other computers on my home network.
5. Setting Login and Password to match my admin login or guest/test login or login for the specific NAS user.
6. Every possible permutation of Host and pathname with each of the above (just in case).
7. Updating the latest versions and windows patches.
8. Disabling my firewall (temporarily).
9. Renaming my Workgroup and restarting both machines then trying the various account settings above.

Still no luck whn I press 'Test Connection' I get ... Error connecting to //*****whatever path I have tried****.

I note that a number of people seem to be having the same problem but they have not come back to this or other forums, so I assume they have fixed it and there is a simple solution I am missing. I chose this NAS because is scored well for ease of use and it was recommended for those not accustomed to setting up a server. Must be a simple solution I am missing???