Badly written code ( free screensaver image viewers ) usually barfs at the leng of file names and the inclusion of spaces. First try removing the space. After that try flattening the files for the wallpaper.
It's also quite possible that the screensaver will barf at having such a long list if you have pointed it at all 5720 directories
Howevr, never foudn an issue with the free album viewer screensaver included in WIndows 7
"A woman without curves is like a road without bends, you might get to your destination quicker but the ride is boring as hell'