Sounds like you forgot to download and put the script in the scripts folder.
Usually the script folder, for windows 7 users, is here:
Let me know
Hey trashtalk, I should have followed your suggestion.
I just added a small feature to the script: select only the guides close to the vertices of a mesh or a nurbs surface.
This is useful if you want to filter only guides that are close to the vertices of the scalp.
I found it nice to have a better distribution of the guides, if you want to keep a low number of them. Sometimes I subdivide the scalp mesh once to obtain a higher number of vertices as sample.