How do I know the ESET NOD32 system works on my computer?

You need only to look at the supported platforms list on our Products page.
If the operating system you are using is listed there, then ESET NOD32 will work on your computer. Basically any DOS, Windows, Novell or Linux system should be Ok. Mac operating system is not supported.
If you have ESET NOD32 full/ trial version installed on your computer, you can just click here (AntiVirus test file) and if you have the resident antivirus monitor AMON (part of ESET NOD32) running you should receive an alert to see if it is working.