Photoshop. And I have been making all different types of sigs for quite a while, and I still rarely use C4D's, it's just not necessary I feel...
You don't know enough about Limewire as it is, what makes you think you'll understand torrenting? And yeah, of course it opens when you open...
Don't use Paint.net use PS. And don't use C4D's until you get better.
I don't see what you've done, all you have done is add past some renders on top of C4D's.
It's nice, and all, but the text and render irks me. But I can't put my thumb on what. Follow the rules. btw: It sucks, it's all I can say....