ESET NOD32 Antivirus and ESET Smart Security protects your computer from viruses, Trojans and other forms of malicious software. It will inspect every website you visit, email you receive, file you download and disc inserted into your computer. NOD32 will also periodically scan your entire computer in case a virus manages to slip past undetected. Real-time monitoring, however, "can occasionally cause abnormal system behavior" with certain types of applications, according to ESET, the program's developer. NOD32 provides an exclusion list onto which you may add programs and files you want NOD32 to ignore.