It is important to make sure that you have the correct version of C/Front for the version of Microsoft Dynamics NAV that you are running. To find out what version of C/Front you currently have installed, please follow this procedure:
Find the C/Front Program Files folder:
C:\Program Files\Microsoft Dynamics NAV\SDK\CFRONT
C:\Program Files\Microsoft Business Solutions-Navision\SDK\CFRONT).
Locate the file cfront.dll or cfront.ocx.
Right click the file.
Click the Version tab (Windows XP/Server 2003) or the Details tab (Windows Vista or later)
Note the File Version: or Product Version number