Photosynth running out of memory? Do you have Windows XP SP2? (Not SP1, not SP3 - just SP2) We have a workaround available for you. All you need to do is install WIC (Windows Imaging Component). There are two options for the install: You can get WIC directly from the Download Center (http://www.microsoft.com/downloads/details.aspx?FamilyId=8E011506-6307-445B-B950-215DEF45DDD8&displaylang=en), for free - but this requires Windows Genuine validation.
An easier way to get WIC is to simply install the latest Windows Live Photo Gallery. (http://download.live.com/)
If you can install SP3... that would be the ideal solution. (http://support.microsoft.com/kb/322389/)