Execute gsmartcontrol.exe; Let the install complete and launch the programme.
Identify your drive in the list, and double-click on it to bring up it's window (usually you'll find your drive by it's size or it's brand name);
Go in the Perform Tests tab, then select Extended Self-test in the Test type drop-down list and click on Execute (this test can take a few hours to complete);
Once the test is over, the results will be displayed at the bottom of the window. Please copy and paste these results in your next reply;
Also, go in the Attributes tab and if you have any entries highlighted in red or pink, take a screenshot of the GSmartControl window and attach it in your next reply;