http://www.bullguard.com/try/bullguard-internet-security.aspx
I have used Bullguard on around 15+ pcs now and the great thing about it is it is not memory hungry like Nortons and Mcaffee.you can download the 60day free trial,it comes with anti virus,firewall etc and does exactly what it should to protect all your internet needs.When the 60 day trial is up I have always purchased a new licence from ebay for £6.45 and all you do is type the license key in and you then have another 365 days.
Bullguard can be installed on up to 3 pcs registered under the same email address,they also have an online chat for support.I wouldnt use anything else.
If you need to know more please get in touch by xfire or pm.
Hope this helps.