Windows Vista and Windows 7: C:\Users\[user name]\AppData\Local\Adobe\Adobe Captivate 6 folder
Windows XP: C:\Documents and Settings\[user name]\Local Settings\Application Data\Adobe\Adobe Captivate 6 folder
Mac: /Users/[user name]/Library/Preferences/Adobe Captivate 6 folder
Close down Captivate before renaming or deleting these folders. Captivate creates a new on on first launch.