The Ukrainian National Antivirus is a complex solution designed to protect PCs and work stations against viruses and Trojan programs. Antivirus scans a computer memory, hard and floppy disks, and deletes unknown viruses, Trojan programs and other components, which may appear to be harmful. Detecting more 98816 of viruses and Trojan program. It also makes it possible to trace back (monitor) brand new viruses and Trojan programs. The Program Antivirus UNA is optimized for operation with Windows95/98/ME/NT/2000/XP and is a virus-polifag with the built-in functions of a disk reviser, the heuristic analyzer, tools for automatic update via Internet. The whole set of programs having the same name ?The Ukrainian National Antivirus? is made on basis of antiviral kernel developed by the Ukrainian Antiviral Center.