When I build my sitemap there are only 15 files on it ...I have about 800 pages on my website?

I have read the page..
http://www.microsystools.com/products/sitemap-generator/help/root-aliases-start-paths/

but I don't have Root Path Alias and Beyond Website Root Path options on my Start Scan/Paths page?

Please switch off "Simplified easy mode" to see all options:
http://www.microsystools.com/products/sitemap-generator/help/easy-sitemap-generator-mode/

(You should have received above as "Tip of the day" when you the first time ran A1 Sitemap Generator.)


This help page may also be relevant to your problem:
http://www.microsystools.com/products/sitemap-generator/help/sitemap-robots-noindex-nofollow/