That fixed the issue, however with Finders Keepers, I can not get the statistics window to work nor the sounds to work, as if Finders Keepers isn't reading something right.
Running as "Run as Admin" fixed the "Cannot find Diablo Process" error message, however sound + statistics window do not work for multibox setup of D3 under ISOBoxer Suite + Innerspace.
I followed the video tutorial as well, tried running on 1/3 processes, 2/3, 3/3 and none of it worked.