Thank you for that link. I have been away for a few days and have just read your post.
According to this page I should be able to add comments to any folder, but their directions don't appear to apply to my XP.
My original folder question:
I have discovered that if I select all the files in the folder in question and copy them to another location, then all the comments are copied, but if I just copy the complete folder to another location, then everything except the comments will be copied.