Always Download a Antivirus

OK as you all may know we have just moved into our house and got a new computer and everything set up.  Well being the stupid idiot I am somehow we got a virus on the brand new computer in only one day.  I asked my husband what a good antivirus is and he told me a website to get a free antivirus download.  I downloaded kaspersky because it had a really neat name and it removed that meanie virus thing and now we can browse the internet without seeing annoying pop-ups, yay!