Although I'm on linux this is how I have my thumbnail includer setup. Also I have the thumbnail includer setup in my gallery/root.
Code:
$Url_Path = "http://www.shukenja.com/gallery/"; //URL of your photo album, where the index.php is (with / at end)
$data_dir = "http://www.shukenja.com/gallery/data/" ; //URL of your photo dir where those jpeg stored (with / at end)
$images_dir =$Url_Path."images/"; //URL of your photopost images dir where default missing thumb image is stored (with / at end)
$rel_dir = "data/"; // path to the data directory where pictures reside RELATIVE
// to the location of THIS file (used for checking thumbs)
rather than use path names I've used full site url etc... for linking the file up.
again it's not windows but you can see how I Have it setup... It works perfectly on my setup but I can't account for all systems, will try to help where I can though.
if anyone else us using a localhost windows box/system for running their forum and use this hack, if you find a solution please feel free to post it here.
Also if you use this hack please click installed on the forum