great tip! i didnt know about that. +1you also may need to disable simple file sharing in Xp. Just click Tools... folder options... and uncheck the simple file sharing box. That will allow you to change permissions on folders.
edit: sorry to hijack the thread but this is the same question the guy needs help with. i can get to the permissions and stuff but i dont know what to tick to create a password prompt. i can only seem to either allow or block a computer