Windows Script Host Error 0x800700C1 Code 800700C1

I was reading chapter 20 "Automation" of the book by Jeff Prosise "Programming Windows with MFC", 2nd ed. There are instructions on how to create a small automation server with methods long Add(long, long), long Subtract(long, long), and a property double Pi. There's also a script in VBScript to test that server. When I ran that script the message box with error 0x800700c1 was shown.

The problem was with the file \Documents in my system drive (where Windows is installed). The automation server was in one of \Documents and Settings subfolders of the same drive. After deleting \Documents file everything ran fine. I currently don't know which application created that file.