Which Antivirus software is very good for the personal computer?

As you have not mentioned whether you are looking for Free Antiviruses or Paid ones, I've collected a number of Best Antiviruses that you get Free of cost:

1. Norton Free Antivirus
2. Bitdefender Antivirus Free Edition (2014)
3. Comodo Antivirus 8
4. Panda Free Antivirus 2015
5. AVG AntiVirus Free 2015
6. Malwarebytes Anti-Exploit Free
7. Avast Free Antivirus 2015
8. Ad-Aware Free Antivirus+ 11
9. FortiClient 5.0
10. Qihoo 360 Total Security Essential

The number and the sequential order denotes their rating given by users across the world.

Go with Avast or Norton Antivirus for PC, which should serve your cause

Based on your computer configuration following antivirus works just fine for you.

1. Nod32 - Less load on system. And also affordable if you wish to purchase it for your machine. I have used it for even lower configuration than yours. And the performance wise it is very effective.

2. AVG : They have the simple interface and also less resources for the background UI. And the services can also take care of the security issues in the background. It can also replace the windows firewall for you. And compared to Windows defender and the firewall, it is more effective.

I won't choose Norton and few other antivirus for RAM under 4G. The memory consumption of Norton increases after a while. I don't trust the ratings and the sponsored review system of those antivirus. So I'd tell you that experiment on your own and then decide which is a right option for you.

Confidential data is nowadays main concern of every PC user. Already being in 2016 there are many new anti-virus upgrades which will help you. As per technical experts - Bitdefender and VIPRE are the best performers in this field.

Bitdefender Antivirus Plus 2016
Bitdefender is leading anti-virus from long time providing regular updates and security to its users. Most anti-virus software are resource hungry whereas Bitdefender only uses around 7% of your CPU. Apart from all these it can protect you from almost every virus threat.

You can Bitdefender Antivirus Plus 2016 for about $40 from Amazon.

VIPRE Antivirus
VIPRE came into existence in 1992. As per expert reviews it gives you best real-time protection whereas in case of any issue with functioning or your PC affected you get full-time technical support as well. In 2016 test VIPRE handled almost every worm or virus attacking the test computer. Apart from giving good secutiry it is also resource free.

You can get VIPRE Antivirus for 30$ from Amazon.

Regards,
Joy Joon

Well, since your system has lower memory, I would advice you not to opt for the high end anti virus solutions. They are heavy on your resources and having them with real time protection will considerably slow down the performance of your device.
A few of the best options for you would be -

1. Avast
It Is one of the quality anti virus solution available. It comes with an exciting set of features. It also provides you application analysis and such advanced features.

2. BitDefender
It has been voted as one of the best by users. It does not come with many settings. Quite minimalistic in design. Perhaps you will not like it if you want to fine tune the security settings. It has no scans, no settings or no scheduling. Once you install it, it just takes over and handles the real time protection.

3. ESET NOD32
It is one of the effective anti virus program with some good extra features. The software does not interfere with your day to day functionality of your machine. It does not have anti spam filter though.