QuickBooks is a popular financial software application created by the makers of Quicken and TurboTax. QuickBooks is actually the big sister to Quicken; it's designed to handle larger organizations. All three products are meant to help automate the bookkeeping function, which should cut back significantly on the amount of time you spend dealing with the books. However, when you're having trouble with the system, it can take a great deal of time. If this is the case, the best way to re-start the installation process is remove the registration file in the program.
Right-click "Start" and select "Explorer," then "Tools," then "Folder Options." Depending on the version you are using, you might need click "Start," then "Control Panel," "Tools" and "Folder Options."
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Select "Show hidden files and folders" from the View tab. Click "OK" to save changes.
Search for the QuickBooks registration file. Click "Start" again and select "Search." Choose "All files and folders." When prompted, type "quicken.lic" and click "Search."
Right-click on this file and click "Delete." This should undo your original registration, which will allow you to register for the product again and re-download the product.