When a QuickBooks function is damaged or when a simple reinstall does not correct an issue, you may need to uninstall QuickBooks, rename installation files left behind, and then reinstall QuickBooks. This process is called a Clean Install or Clean Uninstall.
Note: Be sure to have your QuickBooks download file or your installation CD and installation license available before uninstalling QuickBooks.
Important: If you do not want to run the QuickBooks Clean Install Utility, you can manually rename the QuickBooks installation folders using the following instructions.
Use Windows Explorer to locate and rename each of the folder locations listed for your version of Windows. As a suggestion, add 'old' or 'damaged' to the end of the folder name. This will prevent QuickBooks from recognizing the folder in order to create a new one.
QuickBooks 2006 and earlier folders: