Got a weird problem with Vista, and was wondering if anyone else had encountered this or knows how to deal with it. Firstly background - I've got a Vista Ultimate x64 machine, and 2 XP Pro machines (not x64). Currently connected using a workgroup. If i use the C$ to connect to the Vista machine from the XP machines, I get the password prompt as expected. I can then enter my Vista login details and connect as normal. However, if I try the same from the Vista machine to the XP, it just keeps asking for the password. I'm using my user details from the XP machine but its having none of it. After entering the user details using either username or XPcomputer/username, when the password prompt comes back, the username field actually has VistaComputer/Username. Even removing/replacing this and trying again has no effect. Its worth noting that the username is the same on both machines, indeed they both even have the same password. I havent tried setting up an account on the XP machine that doesnt exist on the Vista machine, but I'll try that when I get home tonight. Anyone have any ideas? Its a pain in the A*se when im trying to pass files across as I have to log onto the XP machine.