What are we talking about here, Windows RDP (Remote Desktop)? One of the things I don't like about RDP is that it *requires* your PC have a password (at least I’ve never been able to get it to work without one). So if indeed you've setup your Windows PC w/o a password, RDP is not going to work unless you add a password. Or choose another remote desktop solution (LogMeIn, TeamViewer, VNC, etc.).
Personally I’m not a big fan of RDP anyway, this being one of several reasons. I much prefer LogMeIn, or even better, installing Hamachi and running VNC over it.