If you bank with Barclays you can get a full version of Kaspersky Internet suite including anti virus for free for life. All you do is sign in to your Internet bank and click the Kaspersky offer link and they email you an activation code. Kaspersky is by far the best to use. Wipes the floor with avast and avg also if your worried about power there is a gaming mode built in you can activate to reduce running power. Have a look. It's a 3 user license too. If your not barclays find a friend that is. Also if you have a joint account both people on the account can request a code so that 6 licences for free!!