Here you can find some help.

  1. Click Start, point to Run, type gpedit.msc , and then click OK to start the Group Policy Editor.
  2. Open Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options\Accounts: Limit local account use of blank passwords to console logon only.
  3. Double-click Limit local account use of blank passwords to consol logon only.
  4. Click Disabled , and then click OK.
  5. Quit Group Policy Editor.
  1. Click Start, point to Run, type eventvwr , and then click OK to start the Event Viewer.
  2. Go to Windows Logs , and then right click System , choose Filter Current Log.
  3. Change All Events IDs to 1074, 6006, 6008, and click OK.