Invoking screensaver coughs up error.

On one of my machines, running XP Home, I have had a screensaver called Text-Reader Saver. It displays a large analogue clock, the size of which may be ajdusted, against the desktop backgound, the brightness of which may be adjusted.

I put a copy of this on my other machine, running XP Pro, but it doesn't work.

When it is called, I am presented with a small window bearing the title "saver error.txt - notepad" and the message "Cannot create file C:\WINDOWS\trscr\htm\screen.bmp"

Annoying.

Why, and can anything be done so that it works correctly?