Can't start: download and install  Visual C++ Redistributable Packages for Visual Studio 2013 x86 version.

Missing .NET Framework: download and install  Microsoft .NET Framework 3.5 or newer.

Missing Language Pack or Missing 'MH4GDatabase': unzip all the files of the MH4G Dex .zip into the SAME folder – you must end up with this:

If you are still experiencing the error on Windows XP, follow  this procedure for all Chinese, Japanese and Korean languages that you see in the list. If they don't appear by step 6, do step 9 before. At step 9, do not check “Install files for complex script and right-to-left languages”. Reboot your computer.

Note: if you are asked Windows XP installation disk, download  this .zip, unzip it and put it somewhere you can easily remember. When the Insert disk pop-up appears, click OK. Near Copy files from, click Browse, find the i386 folder you just downloaded and unzipped, double-click on it and click Open.