PPSSPP does not start at all (no error message)

[[Unknown]]

It doesn't need any devkits, but it does need DirectX and the Visual C++ redists. Normally you'll receive an error message when these aren't found. Maybe there's a way to configure Windows not to show any.

Try installing these:
http://www.microsoft.com/en-us/download/...x?id=13523
http://www.microsoft.com/en-us/download/...px?id=8328

DirectX I think is in Windows Update, you can try this:
http://www.microsoft.com/en-us/download/...aspx?id=35

Would be interested if that helps or does not help.

-[Unknown]