Hi CarynED,
Due to the urgency of my problem at the time, I actually had my laptop reformatted to get Captivate 5.5 to work for me.
But during the stress, no amount of uninstalling and reinstalling of Cap5 or 5.5 helped unfortunately.
To the credit of the previous two replies before yours (parthvyas and puspendra yadav) Thank you for responding with ideas for solutions and support. I unfortunately didn't get the chance to try either of these two options before I went for a hard reformat.
Since then Captivate 5.5 of course works on a refreshed laptop and instal, and I have now even updated to Captivate 6.
Also no CTD's to report to date either. I think I just had hard luck at the time.
Have you tried either of the above ideas or contacted tcssup@adobe.com as per above? I'd be keen to see how you get on. Good luck!