Do not use Simple File Sharing 

;Do not use Simple File Sharing
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa]
"forceguest"=dword:00000000

» Example Registry Tweak
;Do not use Simple File Sharing
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa]
"forceguest"=dword:00000000