Pdf creator starts installation when run from guest account

 pdf creator Version 1.1.0

My notebook runs with Windows 7 Professional 32-Bit (automatic updates) and I enabled the guest account for a visitor who wanted to scan some documents.

To reduce size of the resulting PDF documents I proposed to print them to pdf creator and use a high compression. But starting the application there were about 15 messages shoing installation of 'microsoft office professional hybrid 2007' is running - aborting - and triggered again. After this the PDF Print Monitor is shown and the document can be saved with no problem. Any idea of the reason for this and how to solve - than giving the visitor a normal account which has more access?