I would say uninstall it, make sure the registry entries for it are cleaned up and reinstall it Joel. I just ran a sitemap for your site and it finished without any problems so it's definitely on your end somewhere. Maybe it just glitched at installation who knows
I don't think it is a problem with the software as it took less then 2 minutes to map your Website. I would think more towards what Jo Ann said is correct. Probably a bad install, low system resources, anti-virus/firewall or the bloody DEP/UAC that Vista so kindly installed for us
Try adding our software to the DEP exceptions list and see if that helps any.