The first thing I did was update my video drivers, and I currently have DirectX 9.0c.
The second thing I did was set WoW at a lower resolution, but that didn't work either...
And I'll throw this in too!
Operating system: Windows XP Professional (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_gdr.090804-1412)
Processor: AMD Athlon XP 3200+, MMX, 3DNow, ~2.2GHz
Memory: 1024MB RAM
DirectX Version: DirectX 9.0c (4.09.0000.0904)
Device Name: NVIDIA GeForce 6600
Driver Version: 6.14.0012.5721 (English)
Driver Date: 6/7/2010 16:57:00
Driver DDI Version: 9 (or higher)
DirectDraw Acceleration: Enabled
Direct3D Acceleration: Enabled
AGP Texture Acceleration: Enabled