Well, I'm not sure what to tell you. My only suggestion would be to install Teamviewer on your computer, and then
email me with the login/pass and I'll look at it when I get a chance. I'm a little indisposed this week (with a kidney stone), but I'll try to find some time late at night or early in the morning when you're not using the computer and see if I can figure out what is causing it.
However, I personally use Innerspace+ISXEQ2+EQ2 with Windows 8.1 ...so, it's not Windows 8.1. It's typically a permissions issue and/or a bad download of the software.