ESET Online Scanner is a semi-free scanning tool. It will allow you to run a scan one time to see if you have any problems then it will ask you to pay for future scans and/or to fix the problems it identified. The tool offers a free trial for thirty days after your first scan.
Find Out If You Have Malware
The ESET Online Scanner is a virus checker but the paid version is also able to add firewall protocols. It is able to add them to your browser in a way that doesn't (usually) affect your network/Internet firewall. The tool checks your computer and finds malware. It usually gives a false positive the first time you use the software so that you download it and use it. You know it is a false positive because you may uninstall use different details re-install and it tell you that you have the same malware you had last time. It offers to remove your malware problems for free the first time and then offers a 30-day free trial where you may try it out before you buy.
Conclusion - There Are Worse Scanners Out There
The fact that the ESET Online Scanner doesn't charge to remove malware during the 30-day trial suggests that the developers are not out to make a fast buck. The scanner is not as good at Norton and other virus scanners where you need to pay for its use. However this software is streets ahead of many of the free virus checkers on the Internet because the library of viruses and malware is updated more often with this program than it is with free online checkers.