2. In the Group Policy Object Editor, expand the following items:
-> Computer Configuration
-> Windows Settings
-> Security Settings
-> Local Policies
-> Security Options

3. Open the “Network security: LAN Manager authentication level” policy and change the Security Setting to: “Send LM & NTLM – use NTLMv2 session security if negotiated”

4. Save changes and close Group Policy Object Editor.

Method B: (For Windows Vista Home Edition)

1. Goto Start—>Run—> and type regedit. Press OK.

2. Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Lsa

Create the following DWORD value if not already exist:

LmCompatibilityLevel
set value to: 1