your hd is running in dma mode thats good cuz when hds dont run in dma mode their very slow , anyway it looks like a software problem , download hijackthis http://www.majorgeeks.com/download3155.html and click "do a system scan and save a logfile" and open a thread at this section http://www.techist.com/forumdisplay.php?forumid=126&s= and copy & paste it , from that log it will be possible to determine if you have any resource hogging software runnin in the background or some spyware the sites i suggested might have missed , also try to remember what you did before this problem started and you might get to the bottom of it , you welcome