Can not run custom scan with bootcamp/windows volume excluded

I haven't received a reply here so let me clarify why I want to do this.  I need to workaround my windows 7 volume.  I am desperately trying to exclude this volume from scanning as one of the workarounds that was mentioned was to do a custom scan without the windows volume.  But if I can't run the set up custom scan because the play button is gray, what good was that advice to set up a custom scan???  Someone please address this issue. . . .

I haven't received a reply here so let me clarify why I want to do this.  I need to workaround my windows 7 volume.  I am desperately trying to exclude this volume from scanning as one of the workarounds that was mentioned was to do a custom scan without the windows volume.  But if I can't run the set up custom scan because the play button is gray, what good was that advice to set up a custom scan???  Someone please address this issue. . . .