SH3 commander question

I seem to be having a problem with my SH3 commander. I enter in all the info I want and then click for the game to start, but get a warning that "SH3 commander has found a running instance of SH3. Please close SH3 and all associated files before retrying." Perhaps I installed commander in the wrong place; C:-program files(x86)-steam-steam apps-common-SH3-SH3 commander.

Opinions....