Using QBI 1.2.2 with QuickBooks 2006 will initually result in 0X8004041c and 0X8004003 errors
Perform the following steps and download file for compatibility with US and Canadian QuickBooks 2006
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Open QuickBooks 2006 and perform an update. File > Update Quickbooks… In the “Update Quickbooks” window, click “Update now” then click on “Get Updates” button. Shut down QuickBooks when finished. 
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If QBI is not presently installed, do perform the installation as per the AyaNova QBI Installation & User Guide section “Installation of AyaNova QBI Trial Mode (Part 1 of 2)” starting on page 7. The Guide is available from http://www.ayanova.com/manual.htm and is required to confirm installation successfull. 
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If QBI is already installed, go to step 5. 
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After QBI installation , reboot the computer 
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Login with administrative access with no other programs running, and perform the following: 
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Download the Intuit QBFC5 installer from http://www.ayanova.com/files/QBFC5_0Installer.exe 
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Install the QBFC5 installer. Reboot the computer. Open Control Panel -> Add/remove Programs and confirm that QBFC 5.0 is installed. Click on the Support Information and confirm the version is 5.0.00203.0. You will also note that a QBFC3.0b is installed - do NOT remove this. 
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Perform the steps in the QBI Installation & User Guide section “Initial Setup of Trial AyaNova QBI (Part 2 of 2)” starting on page 10 to configure QBI connection between QuickBooks and AyaNova. 
If you have any questions - please post in the QBI Support forum http://forum.ayanova.com/Forum17-1.aspx