Something else you might want to consider if you haven't already, Don't Install SH3 into the default path. Create a folder or use an existing one and put game files there. Theberbster and Blitzkrieg are giving good advice as well and Theberbster touched on that in thread
http://www.subsim.com/radioroom/showthread.php?t=225889
these gentlemen are pretty sharp and knowledgeable.