Windows XP and Windows Vista is no longer supported.
(1): The product might use more memory on a heavily infected computer or when huge lists of data is being imported into the product (for example, URL white lists).
(2): The disk space needed to download the installer, install the product and keep a copy of the installation package in program data as well as backups of product updates to support the rollback feature. The product might use more disk space under different settings (for example, when more product update backup versions are stored, memory dumps, or huge amounts of log records are kept) or on an infected computer (for example, due to the quarantine feature). We recommend keeping enough free disk space to support the updates of the operating system and for ESET product updates.
(3): Although not recommended, the product may be updated manually from removable media.
Although users can install and run the product on systems that do not meet these requirements, we recommend prior usability testing to be done based on performance requirements.