Are there any security risks in using this methods?
I can't think of any security risks if you are just copying and pasting the list yourself. All it's doing is when your web browser is trying to go to an ad website, it directs your browser to go to your computer instead of the Internet, which of course goes nowhere.
So, if it goes to the PC it's not cached and won't clog up any memory?
No, it just basically dies. It tries to find the page and when your computer sends nothing back, that's it.
Awesome. I'll try it. My PC sucks as it is.
Anyone got any links to free malware, antivirus, pop up blocker?
