This could be a file ownership problem. If the current user doesn't have ownership and read/write permission of the ".kde" and all the files in it, this could occur. The ".kde" folder is in /home/[your-user-name].
Try this: login as root in a terminal (type "su," then your root password).
Then type the following: chown -hR [your-user-name] .kde - no brackets, just the user name you're logged in as.
Post back and let us know if this helps or not. I'm confident there's a solution to this problem