Thanks for your input, Pascal
I uninstalled WP (and had no ERROR message this time)
I carefully removed all possible COREL folders from my machine, including the template
I ran a virus check (one never knows....)
installed the software anew (no ERROR message either... I was hopeful)
but as soon as I opened WP... it stopped working
QP still seems fine
As for the "c:\windows\installer" folder, I reach it when I type the path... but this does not allow me to get to the properties of the folder to check the permissions.
my Folder Options is correctly set to "view hidden files and folders", yet I can't see this one
so I'm back to square one....
EDIT : I renamed the root folder but WP promptly created a new one (and stopped working just as fast)