HD Read Error Rate Recently I got some SMART message when I turned on my computer saying theres soemthign wrong with my HD. Now my computer boots up really really slowly and sometimes it will come to a crawl. Would a bad HD cause this? Is there anythign I can do to fix it? Or do I have to buy a new one? The hard drive is a Western Digital caviar (80GB, 7200 rpm, 8mb cache) and is about 2.5 years old.