After purchasing Registry Reviver you will be able to remove all of the errors found on you computer. If after you have purchased you still cannot remove the errors this is because the software needs to be activated using an Activation Key that you receive after purchasing. The activation can be found on both the web page that you see after your purchase and in a purchase confirmation email that you receive after the purchase. This email is sent to the email address that you specify during purchasing. Please make sure that you check your SPAM filter if you cannot find this email in your inbox. If you still cannot find this email after looking in all possible folders, please feel free to contact our support team, they will be happy to help you locate your details for you.