Hi There,
Can you please try the below steps and see if this works:
1. Right click on MS-Word icon.
2. Go to Properties>compatability>Change settings for all users.
3. Under Privellege Level> "Check" Run this Program as an Administrator.
4. CLick "Apply" and then "OK".
5. No do Right-Click on Captivate icon and do "Run-AS- Administraror".
6 Now try to export the Captions and see if you are still getting the same error message.
Regards,
Mayank