OBS Studio requires some additional files (Visual C++ 2017 Redistributables) that are not currently installed on your system. Please run both of these Microsoft installers in order to continue setup:

Visual C++ 2017 Redistributable [64 bit] - vc2017redist_x64.exe

Visual C++ 2017 Redistributable [32 bit] - vc2017redist_x86.exe

Both the 32 bit and 64 bit versions need to be installed, even if you have a 64 bit version of Windows.

Note: If you're using Windows 7 / 8.1, make sure you have also installed all available updates from Windows Update (or manually install the Universal C Runtime update).