Same thing happening to me after installing Microsoft Office 2016;
I was recently prompted to reinstall my instance of MiVoice Office 250 System Administration & Diagnostics. I believe this was caused by a recent upgrade to 64-bit Office. Anyway I am not able to reinstall the 32-bit version of MiVoice because I have 64-bit Office. When I try to install the 64-bit version of MiVoice I am told that the 32-bit version is still running, and that I need to uninstall it first. I have uninstalled every application in Add/Remove Programs that was labeled Mitel or MiVoice, and yet the error message persists. Any suggestions on where else to look for remnants of the 32-bit that are blocking my install of 64-bit? Thanks.