TalkTalk has upgraded its Super Safe Boost, meaning users can now install it on five PCs, as opposed to just three.
Adrian Taylor, the broadband provider's security product manager, claimed there has never been a better time to take security precautions - with one in five people having fallen victim to online crime.
He explained that the Super Safe Boost - designed to shield users from identity thieves, spam, phishing emails, viruses, worms and spyware - costs just £2 per month for TalkTalk Essentials customers.
The add-on is free for households with a TalkTalk Plus TV subscription, Mr Taylor noted.
"It can clean up Windows computers that have already been infected with malware or a virus, and protects all the precious things stored on your computer, like photos and music, bank details, social media log ins and other sensitive data," he stated.
"Because the software is installed on the computer, it keeps working even when you’re out of the house, and can be used alongside HomeSafe."
Mr Taylor further added that with many homes now having more than one computer, it is important to ensure there are enough licences for everyone to use.