Before I read your reply, I read around the forums, and saw that I should use HD Tune. For the health section the only two things that are bad are Seek Error Rate (31), and Seek Time Performance (1). Also when I tried the error scan, when the green block reached around a tenth of the way, my HDD started making clicking noises, and my computer froze.
This sounds (no pun intended) like a bad thing. Should I change my HDD asap?