Okay, here we go...

I need a new Programming language.

Coming from a Python background, so go easy on me. x.x

C# can do what I need, but it's quite complex for me. I'd rather something simplier is possible.

Brief summery:
So, I've come to realize that I wont be able to make my Python game(ExitCode) as powerful and fancy as I'd like. And I decided that I should just start from scratch before I go any farther. (Though, I might go ahead and stabilize the current versions on GitHub)

Here's what I need:

Powerful UI support;
* I am re-creating an OS as my game. I will need to drag and position windows and icons in-game, as you would in a real OS.
* Needs to support Ads, Animations, Images, Videos, Sound, and any other media I might need?
* Preferably can render HTML & CSS (Though, this is just a preference)

Support for reading JSON and/or XML files SAFELY (XML had major vulnerabilities in Python)

Supports Windows, but I would prefer cross-platform-ability

Easy to compile

I am not really looking for a game ENGINE. I am looking for a language to create a game in from scratch, that has powerful UI libraries.

In the end, the game will be Free, and Open Source. (Always!~)