Shoutbox

Ever since i put in the new HDD my computer's preformance has dropped.  It seems to be slower, and it has a lot more unresponsive program errors, and alot of those send error report things.  E.G.  I open VLC and instantly an Error appears saying VLC has encountered an error and needs to close.  It has gotten a lot slower too, E.G. I have WoW open and I have WLM and OD open (on old HDD) It all work smooth and good, With new HDD, i can hardly have windows Messenger open with WoW sometimes.  Im going to scan but The only thing i can thing of is how fast the Disk can rotate or whatever it is called.  But the HDD im using now isnt that old, well maybe it is about since 2001 I have had it in another computer and then put it in this one since my less than a year old one is having problems.  And i tried to run scan disk on the other HDD and it froze about half way through

Any help?

EDIT:  Now that i think of it, would the slowness be caused by the screen resolution?  b/c i had it at 1152 by 864 last time and now i have both moniters on 1280 by 1024.  Im pretty sure that is the most likely reason but any suggestions>