Error: AWStats database directory defined in config file by 'DirData' parameter (d:\websites\awstats\data\raingarden) does not exist or is not writable.

Setup ('D:\websites\awstats\cgi-bin/awstats.www.raingarden.il.gov.conf' file, web server or permissions) may be wrong.
Check config file, permissions and AWStats documentation (in 'docs' directory).