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Security attacks are increasing in size and severity. During the past year, the Heartbleed Bug became part of the English lexicon, SnapChat and iCloud were rocked by data breaches. Millions of consumers were impacted when Home Depot and JP Morgan's databases were hacked into. To ensure better protection, every PC owner needs effective, reliable antivirus software. Unfortunately, this can be expensive, especially given the cost of annual updates.

However, there are plenty of free antivirus software solutions on the market, many of which are just as capable as their commercial cousins. So if you're tired of annual subscriptions, read on - we've picked out nine of the best free internet security tools to deliver great security at no cost.