Troubleshooting internet connection issues, firewall settings, and having mulitple instances of QuickBooks installed on the computer.

Configure the Windows firewall for Windows 7, Vista and XP, adding ports as needed.

QuickBooks 2007 or later and QuickBooks Enterprise Solutions 7.0 or later are supported on Microsoft Windows Vista.

Error 1603 can occur during QuickBooks installation because of problems installing Microsoft .NET Framework.

This article describes two possible installation errors: either the installation is interrupted and the action is rolled back, or the QBFCService fails to start.

It is sometimes necessary to uninstall and reinstall all other Intuit programs in the QuickBooks installation folder (as well as QuickBooks),  if QuickBooks does not function correctly after a reinstallation. This is referred to as a clean install.

During an installation or update, error 1304 ("Error writing to file [file name]. Verify that you have access to that directory"), which can occur if QuickBooks can't write to a file or directory. The error is usually caused by a damaged CD or .NET component.

Lists the QuickBooks files that need to access the Internet through a firewall. Includes QuickBooks versions 2005 through 2009 and later.

Instructions for stepping through the QuickBooks installation wizard when installing from CD.