In my case my images are on an external drive as also my documents are on a different part ion to the programs on c so I too have C disabled.
One think to watch out for is it will try to catalogue every image file and format that it can. I discovered this years back with Thumbs plus. There are an awful lot of images of buttons and icons in the program files that you don't want and in the temporary download files. So with any Media cataloguing application first steep is to point it to only the files and types you want and beware of PDF. Its an image format but could contain 30 pages in the one file Now that will slow PSP a little and do you want to use psp to read them any how