Hi all, I have a windows vista home premium 32 bit vaio laptop and a win 7 pro 64 bit dell laptop. I have set up sharing on both, I can access the win 7 from the vista machine, but not the other way. On vista I have the following setings: Network Discovery: ON File Sharing: ON Public folder sharing: ON Printer Sharing: OFF (on makes no difference) Password protected sharing: OFF Media sharing: ON I have manually set the registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\LmCompatibilitylevel to 1 On the win 7 pro machine I have the following settings: Under control panel > Network and Sharing >Home or Work Network discovery: ON File and printer sharing: ON Public folder sharing: OFF Media Streaming: OFF File sharing connections: 40- or 56-bit encryption (128 makes no difference) Password protected sharing: OFF HomeGroup connections: Use user accounts and passwords. No homegroup has been setup. Both vista and win7 are in the same Workgroup I have made the same manual change to the registry as on the vista machine: Lmcompatibilitylevel is 1 Under SECPOL I have: Send LM & NTLMv2 session security if negotiated enabled. Now when I try access the vista machine from the win 7 machine it used to prompt for a user name and password. I've entered this countless times without success. Now it gives the following error: Windows cannot access \\vistalaptop You do not have permission to access \\vistalaptop. contact your network administrator to request access. Interestingly, I have a third dell win 7 pro N laptop that can access the vista shares without a problem. It doesn't have the registry key nor the SECPOL setting defined! Please help!