You do not need anything extra. Verify that you can use this same net use command on another (non PE booted) client to verify that you have access. You may also try re-arranging your syntax, although from what I understand the order does not matter. I use the following command: net use \\server\share Password /user:user While the domain\user may work, you can also try without putting the domain\ or computername\ part in there to see what happens. The error you are getting means that you are in-fact getting a response from the server, but it doesn't like that account, that password, or that account doesn't have access to the share path, or that account doesn't have NTFS or Domain permissions set properly, etc. So try your command out on another Windows client to see if you get a similar error.