Demos folder disapperared but demos can still be played

[FATCATDAGG]

I would like to be able to delete many of these demos. I have "1-28-08" typed into the auto demo thing at the join screen. When I check the data folder the demos folder is gone. I have a dual booting imac with a windows vista partition. I need help locating that folder, I tried using the search features with out much success. I'd appreciate the help, thanks.