Error wessage when installing System Works 12

I am trying to install System Works 12 on Windows Vista Premium service pack 1 and during the system verification process I keep receiving the following error message:

 

The virtual folder representing the My Documents is invalid.  Please correct this before installation.

 

Can anyone explain to me how to get past his error.  I have tried remaining the default document folder in vista to my documents.  It did not work.