First, there is NO updated drivers. The default Windows/Microsoft driver that comes with Windows 7 is THE driver.
There are firmware updates for drives that can fix some problems. As you have a Dell, with an OEM drive (not a retail version drive) if there is an update from Dell you can install it and see if it helps. However, there is no "Samsung" drives listed in the available Dell optical drive firmware updates, however thare are "TSST" drives listed which are Samsung/Toshiba drives. Can you doublecheck the drive model number listed in the Device Manager. as you will need the EXACT model number to see if there is a firmware update for this drive.
Here is the Dell firmware download listing for the Inspiron 531. If you have the exact model number you can check it against this list and if there is one, download and installed using the Dell listed installation instructions. Restart the PC after the firmware update and then see if makes any difference. If not, I still think a replacement drive is a good option. Drivers and Downloads | Dell [United States]