Net protector antivirus is an antivirus that you have to buy or download it from internet.you need to buy product key so that you can download latest version of update which is available on internet and made by net protector team.once you install and enter product key then you can easily upgrade you antivirus it is light in use and does not affect your other software but after one year you have to renew your product which is buy from antivirus site.they charge for that.easy to install and use and uninstall process is also easy not like other software which require more time to uninstall this.