I suggest you avast anti virus, when you power on your computer it will be easily updated its virus data base. and even in offline while it wont allow you the virus/spam/spyware etc., to corrupt on your system data.
Norton and Avast are best anti virus software to keep secure your PC from various types of harmful viruses and worms. These anti virus software having pop-up windows which are up whenever any virus is detected to system, and its automatically heal that infected files with indication and providing full details.
I use PC Tools and Spyware Doctor with Antivirus - it does it all and I've never had any problems since I bought it (not expensive) I used to use AVG but it doesn't stop all viruses unless you buy upgrade. I know because my laptop got infected with a virus and I had to buy new Pc Tools software to fix it
First you register in eset antivirus official site and try again to update the patches. You need to change the best anti-virus program. I suggest you Avast Internet security is best.
i have no idea about it.but i am using kaspersky antivirus and its performance is good.you can get registration key of this antivirus free from internet.so if you want you can use it.