ok, Tortoise installed ok and on the right-click menus as expected.
Created myself an osmarender source folder Documents\OSM\Osmarender\source, right clicked on it and selected SVN checkout. Tortoise comes up and I've pasted http://svn.openstreetmap.org/applications/rendering/osmarender/ which is off the howto page. Not sure how much of this I'll need. 4.96meg downloaded.
Saved osm-map-features-z17.xml and osmarender.xsl to my osm folder off the howto wiki.
Getting the data. I'm going to use JOSM to select a very small area and save it as data.osm.
Now to render it. I'm going to use xmlstarlet because I seem to remember it was the only one I could get to work.
Downloaded the zip file and unpacked to Documents\OSM\Osmarender\xmlstarlet-1.0.1
Now to create myself a text file in notepad where I can experiment with the command lines and paste them into the Run window.
Well that was easy! These 2 commands do it.
cd Documents\OSM\Osmarender
xmlstarlet-1.0.1\xml tr osmarender.xsl osm-map-features-z17.xml > map.svg
I used Opera to view the map.svg file and there it was.
Now to install inkscape to be able to edit it.