Did you get the fix called
SH3_XPSP2_Res_Fix_for_1.4b.zip or the two file "fix"?
The proper fix has 6 files in it, including d3d9.cfg, if you need it you can get it at my FF.
http://hosted.filefront.com/TheJhereg/
Then in d3d9.cfg just edit the resolution section as Wolfehunter stated above after you run the install.bat.