Hi there,
On which operating system are you using Adobe Captivate?
Please recreate the preferences of Captivate, following is the location of Captivate Preferences:
Windows 7: C:\Users\[user name]\AppData (hidden folder)\Local\Adobe\Adobe Captivate 5 folder
Windows XP: C:\Documents and Settings\[user name]\Local Settings\Application Data\Adobe\Adobe Captivate 5 folder
Mac: /Users/[user name]/Library/Preferences/Adobe Captivate 5 folder
rename Captivate 5 to Captivate 5_old
and then try to launch Captivate 5
Thanks.