Mouse "sticky", Sound "bzzst" bcoz of problem with HD

My computer is getting slower and slower. Running torrents while playing Street Fighter IV (offline) will make my computer EXTREMELY SLOW and when I played mp3 while downloading using torrent (utorrent), the music will sound like a broken machine ("bezzzst" kind of sound, once a while).

Sometimes my computer will be extremely slow while booting.

Another symptom is this: my mouse sometimes "sticking" or getting "sticky" (I'm at lose of words to describe this). While I move my mouse, the cursor getting slower, and sticky to move..)

Hard disk concerned: Seagate 160GB ST3160815AS (2 partitions, using quick format)

I've ran:

chkdsk g: /f /r

Completed, got no error whatsoever (no bad sector too)

But on the second partition (D:), there is 12KB of bad sector.

Ran the same command, chkdsk d: /f /r and the problem is still there.

I've ran SeaTools for Windows and this is the log:

--------------- SeaTools for Windows v1.2.0.1 ---------------
1/27/2010 10:18:58 AM
Model: ST3160815AS
Serial Number: 6RAETBQ0
Firmware Revision: 4.AAB
SMART - Pass 1/27/2010 10:18:58 AM
Short DST - Started 1/27/2010 10:19:10 AM
Short DST - FAIL 1/27/2010 10:19:25 AM
SeaTools Test Code: 66E3C3E8
Long DST - Started 1/27/2010 10:22:59 AM
Long DST - FAIL 1/27/2010 10:24:23 AM
SeaTools Test Code: 66E3C3F8
Short Generic - Started 1/27/2010 2:16:04 PM
Short Generic - Pass 1/27/2010 2:21:36 PM
Long Generic - Started 1/27/2010 2:22:56 PM
Long Generic - FAIL 1/27/2010 2:36:12 PM
SeaTools Test Code: 66E3C3D8

I also used Auslogic Disk Defrag and use the option "Defrag & Optimize" on both partition and yes, the problem is still there.

If I unplug the drive, my computer is running smoothly. (My primary hard drive is Hitachi 80GB (HDS721680PLAT80)

Got any clue as to why this is happening?

MORE: I also used HD Tune and quick scan revealed no error occurred while it ran. However, on Health tab, it reveals this: