Can you check the location that you're trying to load from using Windows Explorer (file manager), maybe by trying to rename a file to see if you have write access to the file. PSUD under Windows can only work within the permissions it's given from the OS, so I suspect this is outside of the control of the app.
If the files are somewhere that worked well years ago, but doesn't work well now, for example the Program Files area, you might need to copy and move them to somewhere more "friendly" and it may ask you to temporarily elevate to Administrator privileges to to do it.
Regards,
Duncan
