Hi, I want to install the lightest but yet an effective antivirus, my laptop is a Pentium dual core, with 3GB of RAM, my main usage is surfing the web and college stuff, I don't like the software popups when working and I hate it when the antivirus slows the computer when it scans or finds some threat.. I have tried Avira (the paid version) and I couldn't keep it, every single time it finds a threat it takes ages to finish its "scanning system" process.. so please please help me choose what's good for me.. and I have no problem with paying again for a good antivirus.. thanks