Here's how to do this with the most common antivirus software.This document, titled "Updating your antivirus/anti-malware without internet connection," is available under the Creative Commons license.Bluntly the computer will connect to the internet by itself, and the only way to keep it from connecting is to disconnect the modem from the phone line.Since then while the computer has been disconnected for more than a year and even now it tries to get me to publish my files on the web, with icons to do so appearing on the desktop at startup ect.Antivirus and antispyware are reliable only if they are updated regularly.Note that most of current anti-virus software updates automatically via the Internet.For this, the updated antivirus file needs to be downloaded from the internet and via an external storage devices like a USB stick, an external hard drive, a CD / DVD, the update can be transferred to a PC with no internet connection.The update method of antivirus software varies according to the brand - hence knowledge of the procedures can be useful.
Even if you don't see the symptoms, your computer may be infected, because more and more spyware is emerging.
Spybot-S&D is free, so there's no harm giving it a try to see if something has invaded your computer.
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Only needed if you do not want to use the update function integrated into Spybot-S&D.
This file is what you need if you want to manually update Spybot Search and Destroy.