so I was trying to download a free trial of a Pc game which is available. I downloaded it off of the website, (which I thought) was legitimate. Apparently not. It has since (in the past half hour or so) downloaded multiple pop ups, some browser in manderin (orange and white squirrel icon), and it has restarted my computer and installed a lock-out virus asking me to input some sort of product key. I've tried task manager but the rest of the screen is black except for the box asking me for the product key. Please help!! I'm not very experienced with computers so please dumb the answer down as much as possible!