I am correct in assuming the instructions on creating a report at http://www.lansweeper.com/kb/conficker.aspx are only for the Premium version? It doesn't really indicate that on that webpage.
You can also create reports in the freeware version if you have the necessary sql knowledge. See : http://www.lansweeper.com/forum/yaf_postst234_Syntax-for-report-txt-sql-or-other-scripts.aspx
The premium report builder only makes it a little bit easier.