Vista - Can't turn off password protect in file sharing

I have my desktop and laptop set up for file sharing through the network. Both are on OS Vista. I have no problem accessing desktop files through my laptop, however cannot access laptop files through my desktop. When attempting, I continue to get a password required window, which does not accept any variety I've attempted to use. Neither computer is even set up with a password. Also, for whatever reason, I CANNOT TURN OFF password protected sharing in the network center of my laptop. It will not allow me to do so. I've tried multiple times, but the YES button stays clicked. How can I turn OFF password protect in the network when it won't let me. I have a feeling this may be the problem.