Two ReadyNAS boxen not recognized by Windows 10 Preview

SOLVED!
I had a similar problem connecting Windows 10 to an older NAS. Here is the solution:

There is a setting in windows Local Security Policy which is incorrectly set by default for viewing an older communication protocol NAS.
To access said setting go to the control panel in Windows 10 (or 7), in Category view click on the text “System and Security”, then click on the text “Administrative Tools”.
Now double click and open “Local Security Policy”.
In the Local Security Policy screen on the left navigation tree, expand the “Local Policies –> Security Options” then about 2/3rd’s the way down the list you’ll see a Policy called “Network Security: LAN Manager authentication level”. Double click and change the setting to be “Send LM & NTLM – use NTLMv2 session security if negotiated.”
Then just press OK and close all of the open windows and then try again

In the case of Windows 10 Home, Local Security Policy does not exist; therefore make the change in the registry (use regedit).

HKEY_LOCAL_MACHINE\System\CurrentControlSet\control\LSA
Add:
LMCompatibilityLevel
Value Type: REG_DWORD – Number (32 bit, hexadecimal)
Valid Range 0-5
Default: 0, Set to 1 (Use NTLMv2 session security if negotiated)
Description: This parameter specifies the type of authentication to be used.