I have a few questions and I'm hoping some people could explain it a bit more.

Recently Xamarin has been released to the public for free and you're able to download/install it for free.

Let me say first that I have Windows 7 and Visual Studio 2015 installed on my computer.
I have succesfully installed Xamarin and the Java/Androids SDKs and got it running.

But now I have the following 'problems':

1. When opening a new Xamarin Forms project I get the following message:

"A problem was encountered creating the sub project 'Projectname.Windows'. This project requires a Visual Studio update to load. Right-click on the project and choose "Download Update"." 

Is this because of my OS?
2. When opening the new project, the 'ProjectName.UWP (Universal Windows)' subproject always give errormessages on everthing.

Reason?
3. If I want to run the .IOS subproject, is the only way by connection a IOS device? Is there no emulator for example an Iphone?

Thank you.