Most likely, the error is related to your selection of an international numeric format. CFAST is designed to use the U.S. English numeric format that uses a period as the separator between the integer and fractional part of a number. Unfortunately, the software does not recognize the comma separator and treats the input 2,9 as two separate numbers. To solve the problem, users have simply set up a new user on the machine and set the regional options to "English (United States)" for that user in the "Regional and Language Options" Control Panel applet.