And yech, my computer had exactly the same HD failure. Researched it, apparently that is how all HD's die if you use them long enough, they just try to build enough redundancy in so you don't see the errors until after the average computer replacement time...
Of course, since yours was a XP computer.... :p
EDIT: DUDE! Everyone has assumed since Vamps don't drink alcohol, that's why they slow down... Toady said it happens when they don't drink BLOOD.
E2: Toady just said elsewhere it might be alcohol, as well. (since I made this a post elsewhere as well:p)