No worry if you lost your software application. The guys from HP Support allow you to download the software for free. The application is available for Windows Vista and XP (all versions). Be aware that the program size is rather large and you should have patience while downloading. After you download and run the application, the wizard will provide all the steps necessary to install the product which is easy because user interaction is limited and the software installs itself.
I will provide you with this link for software download from HP Support.