QuickBooks Integration for OpenCart

Hello, I have been using the Open Cart Store Manger for several months to export orders from open cart into QuickBooks, this weekend the QuickBooks add-on stopped working. When I click on "Begin Session" in the export orders area an info box pops up and sais "It seems QuickBooks is not installed on this computer." It happens when QuickBooks is open or if I try to begin a session with QuickBooks closed. If I try to access the QWB file while QuickBooks is open is says this file is being used b...

Im having issues when trying to import products into quickbooks, the products are appearing but my product options are not. ive been told how to do but but when i get the the Map Custom Fields page there are no options for me to select for my product, i have included a screen shot of what it looks like,.