www.sarducd.it

I use free Avast antivirus + free Malwarebytes antimalware.
It is good to have both solutions. Antivirus looks for viruses in real time. Antimalware scans on demand for non-viruses like the one I got recently - multiplug - http://pcspywareshield.com/guides/multiplug/
Single antivirus cannot do all the work. Malwarebytes is focused on malware-adware - which is not a virus and gets on to you PC most often via bundled downloads of media fiels of free soft

Whether an antivirus software is free or not has almost no correlation with its quality. We can find plenty of good reasons to choose a free antivirus software's, and plenty of good reasons to go with a paid antivirus software's. Free antivirus software has one main advantage - its PRICE. The free programs typically offer the basics, such as a simple search and destroy of malware. This is also its limitation too, as the free version usually only protects your system from viruses, and does not offer the comprehensive protection you may require. As you progress through the different types of protection, more advanced features can be added on. Moreover, one of the biggest drawbacks to going with a free antivirus software is the lack of technical support.

Vayne

Is there any way for us to do ?

Avast is best one to have

There is a detailed review and comparison of the most popular antivirus (antimalware) software including ones mentioned above.
https://thinkmobiles.com/blog/best-free-antimalware/
It includes information about their pros and cons, and about the main features also.

Hope this will be helpful