One thing you havent mentioned is directX 9. SH3 was built to DX9 standards - Win7 supports DX10/11 - so you may want to install the full redistributable of DX9.
Also - do you have the UAC or DEP on? If so, turn them off. Make sure you run the program as an administrator -and as odd as it sounds, its best to NOT install the program to the default location "c:\Program Files\" as this can cause issues. Create a "Games" directory on your C drive or install to another drive when possible.
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Good Hunting!
Captain Haplo
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