By copying the entire contents of the user folder to the new folder you will be copying the .kde folder. I think you will find that that is the folder giving you problems.
I have run Mandriva, which PCLinuxOS is based, for a number of years now and have come across your problem myself. By doing something the operating system wasn't expecting
The way I got round it was to create a new user and copy
only any data files and folders from the original /home to the new /home. This of course means setting the desktop environment up again. But at least that is better than a re-install. When finished you can of course remove the original user and /home folder and re-create it, copy/move just the data folders and files back. You will need to be in root account to accomplish the moves as the normal user will not have the correct permissions, also, when the job is complete you will need to give the original user the correct permissions as all the files & folders will have root permissions.
I hope that all make sense to you.
Added : Sorry Roseway I was typing this at the same time as you were typing yours.