Hard Disk is not working correctly, confirmed that I need to get a new one, it's a Dell computer and it came with Western Digital Scorpio 320GB 5400 RPM HDD, got it in 2011.Thinking to get a 500GB this time, which company would you guys suggest? Going to get it from Nehru Place and would have them. hanger it because changing the HDD in this model is quite a task.