Kimi, I have CS3 & this is the path: C:\Program Files\Adobe\Adobe Photoshop CS3\Presets\Styles
If you have not loaded the new styles yet, give this a try.
open a document, add a layer with something you would like to try a style with,
open the styles palette & use the arrow on the upper right to open the fly out menu,
select Load styles.
Find the new styles files (ending in ASL) on your computer & try loading them.
This works just like loading brushes.
I'm pretty sure you must have a CS3 styles folder & your new styles will likely work just fine.
Let us know if this works for you.