New Zealand
You don't need YASM unless you are trying to compile the C++ components - doing that is much trickier as you have to have the right DirectX SDK (June 2010) installed, environment variables set up correctly etc., so we provide pre-compiled binaries in SVN to save people the trouble.
If you are intent on doing that for whatever reason then all I can say is that:
- I'm running XP
- I have put vsyasm.exe in C:\Program Files\Microsoft Visual Studio 10.0\VC\bin
That is all that I require if I need to build the Core.cpp solution (*which is a separate solution*). The YASM.xml, targets, rules and props are already in the right folder (they're in SVN).