You can use QuickBooks clean install tool. First of all, you have to Uninstall QB Desktop. We will discuss steps of these in brief. Open Run command on your computer; you can do this by clicking Windows+R simultaneously. Then move to the Control Panel and there you can click OK. From it, go for Programs & Features. Then, choose QuickBooks and uninstall the program. With this, your QuickBooks will get deleted.
Read more: QuickBooks Database Server Manager