Just do up a simple Favicon for me.

I need to have a 512 x 512 icon done up so that it works properly on browser tabs. I was using one with my normal logo - but it simply doesn't work. I am open to suggestions. I was thinking the A with circle that is currently in my logo - but that is fairly similar to an anarchy symbol. Happy for suggestions. I have included my logo files. My URL is virapex.com I want to get this done today. I do not mind if it is not black and white - but i have used it a lot (including marketing materials being sent out O(example included)