If you've got been trying to open the QuickBooks by repeatedly hitting the QB icon, then leave it a couple of "> for a few time and retry after a few minutes. If still you’re QuickBooks not Opening, then download and install the newest version of the QB tool hub, i.e., 18.104.22.168. Attend the download folder, double-click QuickBooksToolHub.exe and follow the on-screen prompts to put in it on your desktop. Now open this application, click Program Problems, and choose band aid my program. Henceforth, start your QuickBooks application, and if it opens, then don't proceed further. While if the matter still exists, then use the QuickBooks install diagnostic tool from the tool hub application. you'll find it under installation issues then choose QuickBooks Install Diagnostic Tool. The method might take 20 minutes to resolve the issues, and you'll got to restart your desktop after completing the procedure.