Have a machine i've just nuked and paved to be used in a public enviroment, yet still connected to a Workgroup. Would like it to prompt for a logon when accessing any of the network shares as different departments will be using it. It does prompt for a login but the username field is greyed out.

Have disabled simple file sharing, disabled guest account, changed Local Security Policies (Network access Sharing and Security model to 'classic') all to no avail.

A google around has lots of other people with the same issues, lots of 'fixes' with very few feedback. Of course none of these work for me! :)