SonDan1, I empathize with you. I had numerous problems with my KT and Calibre. Personally I think it's Windows XP that doesn't work well with them. When I was trying to get mine working, a lot of very helpful people posted different suggestions in this thread:
https://www.mobileread.com/forums/sho...d.php?t=171786
I realize my error was different than yours, but some of the various suggestions may help you.
Good luck and Happy belated Birthday!