It's malware that ties itself to your QB folder and starts automatically when you start quickbooks. They have exploited security holes in the software and were able to generate these fake error messages.

The files you want to look for below, mine were in Users/Public/Documents/Windows and Users/Public/Documents/Intuit

look for: 90s.rtf , err.html , QuickbooksDownloader.exe IntuitDownloadManager.exe