As we know that almost everything in PC works on the principle of plug and play. Once you get the hard drive disk back from Seagate, install it with caution and follow necessary steps. Windows 7 will do all drivers installations automatically. However, it will download only generic driver. Go to device manager (start, right click on computer, then click on manage and finally click on device manager) and check if anything is missing. If yes, download it from the manufacturer web site. Everything works fine with generic drivers, you can leave it as is. Would you wish to update the latest version, please go the manufacturer's web site. Here are steps to do it:
While being in device manager tool, double click on the hard drive or expand it and then right click on the type of hdd to get a dialog box. Click properties, click driver tab, then choose update driver. Choose the option that suits you. If anything goes wrong, don't forget to roll back driver.