Today I ran a disk defrag, virus scan, spyware scan, and an error checking scan on the hard drive. All came back without any probs. If my hard drive was really about to crash, wouldn't the disk defrag and / or error checking scan say there was a prob. Of course, in all honestly I don't understand everything that the screen says when it is running an error checking scan, but it didn't seem like there was a problem.
BTW, I haven't heard the weird clicking sound today, but I didn't have my computer on very long. And the clicking sound just comes every once and a while. 99% of the time, everything sounds normal. I'll probably go to the store tomorrow and try to buy some extra flash drives just in case!!
Disk defrags are not for finding errors, they are only for improving disk performance. A surface-level scan may also not find any problems. That's why you need a SMART utility like the one I linked in my first post--it can read the drive's own internal diagnostics and determine if anything is wrong.