Microsoft Defender isn't bad, but it's not enough to fully protect your PC. You don't have to pay extra, though—just use one of the top free antivirus apps we've tested.

ZDNET tested the best antivirus software on the market, with support for multiple operating systems, VPNs, and robust protection.

CCleaner has long been a classic among Windows system optimizers, and next year the much-loved tool will celebrate its 20th anniversary. It has such an enduring legacy and has been so popular that ...