Remember on installing GWX 3,
Make sure you direct it to the proper Steam Folder where your SH3.exe is located!
This step throws alot of Steam Users.
Also, for a proper install?
Make sure the volume is turned up!
I ran GWX 3 on a Notebook with a 1.8 Single core,
2 gig Ram and a ATI with 128 megs
Infact? there was a lot of development done on that Notebook!
And the installer also!