SOLUTION:
1. Run regedit.
2. Navigate to:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
3. Create a DWORD value under Lsa
LmCompatibilityLevel
4. Set the value to 1
5. It should looks like this:
5. Quit regedit and from Start click Run type “gpupdate /force”
by George Lopez-Henríquez/ www.inetnj.com