I'm sorry, but I am at a lost to find where I can make a change to the policy for the authentication level in Windows 7RC. I need to set Windows 7 to respond toNTLM since I am using a Buffalo Link NAS. Is it a change to the Registry? Or is it change I can make by navigating the Control Panel? Or something else?

This link is for Vista. It works for Windows 7 as well.http://www.jimmah.com/vista/content.aspx?id=33Kerry Brown MS-MVP - Windows Desktop Experience

Thanks, Kerry. I tried the directions in the link you gave, but could not apply them because the specific items referenced did not show in either my registry or Control Panel options. However, I searched a little more and foundtheinstruction below that did work. The encryption for password authentication to my NAS device worked after making the changes. I did have to manually enter the path to map the desired files as a drive. Using "Browse" didn't show my NAS device. To view/change LAN Manager Authentication level, 1. Click Start, search for gpedit.msc (Start - Run in Windows XP and earlier). This will launch the Local Group Policy Editor. 2. In the leftpane, navigate to Local Computer Policy - Computer Configuration - Windows Settings - Security Settings - Local Policies - Security Options. 3. In the rightpane look for Network Security : LAN Manager authentication level and you should be able to see the set level. On a default install, it should be not defined. Change this to match or be compatible with the Non-Windows 7 PCs on the network. To change, double-click the entry and choose from one of the listed options. Click Apply and OK. The defaults of are Windows 2000/XP: send LM & NTLM responses Windows Server 2003: Send NTLM response only Windows Vista/Server 2008 (& 2008R2)/7: Send NTLMv2 response only This should fix the problem.

You're right. The registry keys are in a slightly different spot in Windows 7. Your method of using gpedit.msc is a better option. Kerry Brown MS-MVP - Windows Desktop Experience