well i finally got the yafray to work!
come to find out, the .0.0.6 version installer works perfectly.
nothing to set up, nothing to turn on, not even a specific directory to install too.
just download it here www.rusmannx.com/yafray.0.0.6win.exe, install it, set the path in blender (it’s in user preferences), select the yafray engine and your done!!!

i hope no one minds me hosting this file on my site for people to download. if i’m not supposed to then i’ll delete it from my server.

Thanks Rusmannx,

I’m on day 2 with Blender, got Python working this morning and (motivated by your post) I downloaded and installed Yafray this evening. Works like a champ, first try with XP SP2.