|All you really can do is make sure your protection software is working properly and up to date.|
Finding the identity of the hacker, if that is the case, would be difficult if not impossible. Finding the ISP who owns the address is easy but only they will know who was using it at the time in question. In most countries it would be illegal to release this information without the necessary legal documents.
Of course, no smart hacker will be using his own Internet access for this purpose. He would likely be using public Internet access or something equally untraceable.