When I intellisync all my contact, notes and tasks update but when it gets to the 3 record of the calender the program shows a critical error mesage and closes. Any suggestions?

Hi there and welcome to the forum, can you supply a little more detail, what program are you syncing to and what does the error message say.

Could be a corrupted entry. Try deleting that calendar entry on your computer and try again. If it gets past that point you know it was corruption.