I have absolutely no idea what a POS notebook is, well I do but I don't care. One thing I do know is that if you listen to this lot you will be trying to keep your computer virus free using anti-malware programs which will not work. I would assume that this computer thing has some sort of operating system and if we knew what that was we might be able to make a better judgment. ALL the anti-virus programs out there are much of a muchness. Paid ones will eat your computer rescources and wont do very much. Free ones will eat your computer resources and wont do very much but at least they are free. If this computer wotsit is using Windows 10 then just go with Windows Defender as an anti virus and Malwarebytes as an anti malware program. Bottom line make sure you back up your important stuff BEFORE you get a virus or malware.