Quickbooks is one of the most widely used accounting software in the market. However, there are times when it will not open due to a malfunction. Some of the causes can be installing too many updates or trying to open the application while it's being updated. In order to fix this issue, you must remove any recent updates before restarting your computer and reinstalling Quickbooks. Quickbooks won't open. If your Windows computer is getting too old for the Quickbooks update, you should consider updating Quickbooks to a newer version.