Stuttering still over 3 years! Any help?

[AstroCat]

Sure ...

Here is my DXDIAG.

Basic current system:
CPU: E8400
MB: GIGABYTE GA-X48-DQ6 DDR2
Mem: G.SKILL 4GB(2 x 2GB) DDR2 1000 (Running 800 1:1 4-4-4-12 2.1v)
PS: CORSAIR CMPSU-750TX
DVDR: SAMSUNG DVD±R SH-S203B
HD1: Western Digital Caviar SE16 WD6400AAKS 640GB
HD2: Western Digital Caviar SE16 WD7500AAKS 750GB
OP: SAMSUNG 20X DVD±R DVD Burner Black SATA Model SH-S203B
Case: P182
HS: Thermalright Ultra-120
Fans: 5 x 120mm S-Flex Scythe
TC: Arctic Silver 5
Vid: EVGA 9800GX2
Sound: X-Fi XtremeGamer Fatal1ty Pro Series
OS: Vista64/XP

The real culprit is HardwareShaders=1 because even at Water=0 or 1 I get some stutters, although better than 2-4. Shaders off is the only way I can get rid of them completely.

Thanks for the help!