Please try to disable "Hardware (GPU) acceleration" in the preferences' Advanced section.
Simply press the Alt key on your keyboard. You can also permanently show it using the menu button from iNFekt's toolbar.
You need to download and install the Visual C++ 2015 Redistributable Package from Microsoft. Alternatively, you can get the iNFekt setup file which will download and install the required files automatically.
Up to and including version 0.9.5 the Visual C++ 2012 runtime was required: Microsoft Visual C++ Redistributable for Visual Studio 2012
Up to and including version 0.8.5 the Visual C++ 2010 runtime was required: Microsoft Visual C++ 2010 SP1 Redistributable Package (x86) or Microsoft Visual C++ 2010 SP1 Redistributable Package (x64)
You can use iNFekt 0.7.9 (32-bit).
You can use iNFekt 0.8.5 or any 32-bit version.