I'm on my laptop right now, which is in no way outdated, but if you want the information anyway it's a Macbook Pro 15" running OS X Lion 10.7.5, it's processor is a 2.3 GHz Intel Core i7, and my graphics card is an Intel HD Graphics 4000 384 MB.

I've played before on the desktop computer but I would like to have it on my laptop. I was originally using Google Chrome, but as I went to download the game it says, "missing plug-in." I click the link to Java, and it says it Java 7 won't run with Chrome. I switch to Firefox, but again the same thing happens, "missing plug-in." I downloaded Java 7 after having already downloading what I thought was Java from "softonic.com," of which I am now slightly suspicious. I tried to delete the softonic .dmg file but it repeatedly says, "the operation can't be completed because the item is in use."

I try again to download Spiral Knights and this time follow the link that says something like, "having trouble downloading Spiral Knights? Click here." I download the game and now I keep getting, every time I open the application, this window:

http://oi47.tinypic.com/dxcnia.jpg (sorry, I don't know how to add pictures to a thread post)

It is quite possible that I made a horrendously stupid mistake, and for that I apologize on wasting your time, but if someone could explain what my problem is and how to fix it, that would be cool. Thanks.