Other than that, all I can do for you is tell you a little bit about the Photosynth creation process.
After you have placed your photos in the synther, given your synth a title, and pressed the [Synth] button, these tasks will be performed:
>> Each JPG will be converted to DZI format.
These will be stored in the temp/photosynther/images folder, so be sure that whichever hard drive the temp folder is on has enough free space to store the converted images.
>> The synther will ask the Photosynth website if an exact copy each image has ever been uploaded before. If the site already has a copy, the synther will skip the upload. If the site does not already have a copy, the synther will begin uploading the DZI version of each new image right away and continue as long as there are more images.
>> The synther will examine a 2 megapixel copy of each image for corners + blobs, make a description of a square patch of imagery around each corner|blob, and try to match them.