Installing QuickBooks Foundation Classes
QuickBooks Foundation Classes (QBFC) needs to be installed before At Your Service can communicate with QuickBooks. The first time that you access one of the QuickBooks modules (see Importing from QuickBooks, and Exporting to QuickBooks), QBFC will automatically be installed. Optionally, you may choose to manually install QBFC.
If At Your Service has already been installed then use Windows Explorer to navigate to the folder where it was installed (by default C:\Program Files\At Your Service). Optionally, navigate to the root folder of your At Your Service installation disk. Run the file named QBFC5_0Installer.exe and follow the directions on the screen.
Installing X-Charge Server