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#1
Well, every warning about unsigned drivers I ever remember seeing went more along the lines of "Windows can't verify the publisher ......." etc. So offhand I'd agree with you about it being a malware trick. Have you ran your malware and A/V scans yet?
It turns out to be a Java security warning. See the link below. I think Java should indicate that it's a Java security warning on the pop-up box. Otherwise, you don't know if it's a malware trick that will load something no matter what button you click.
What should I do when I see a security prompt from Java?
Regards