Hi Christian,
I had the same trouble when I first went on the Tyros3 site. It turned out that it was my Internet Explorer security setting (set on High) that was blocking me.
You could try it and see if you have the same setting - on IE, Click on Tools - Security,
If it is on High - reset to Medium, then click Apply & OK. (You will have to momentarily leave the Tyros site and then go back to it again - should now open ok).
Don't forget to reset to high again when you have finished looking / listening at the site.
Best wishes,
Tony, Sheffield UK