A client wanted to know how to perform file sharing on Windows without needing a password.
(A local network between two computers)
1. In the Windows 7 search box (Start button), type GPEDIT.MSC and click the result that shows up at the top of the results box.
2. Expand the following key: Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options
3. 3rd entry down from top called "Accounts: Limit local account use of blank passwords to console logon only"
Default is ENABLED
4. Right-click on the Enabled and select Properties. Read the help description if you wish, then click Disabled.
Note: Unfortunately, this works only with Windows 7 Pro and higher because Win 7 Premium and lower does not come with the Group Policy Editor. (Typing GPEDIT.MSC will produce an error instead)