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Security advice for home PCs swings between paranoia and complacency, and neither helps. This guide is the middle path: a 20-minute routine that checks the things that actually matter on a Windows PC — real-time protection on, a full scan run, firewall status, startup programs free of junk, and updates current. It is honest about the threat model too: in 2026 the typical home-PC problems are phishing, fake support scams and bundled junk, not exotic viruses, so the routine pairs the scan with the habits that stop those (see the email scam tool). It also names the real infection signs and the calm response when you find something — disconnect, offline scan, and never pay a cold-calling 'tech support'.
A calm, practical security check for a Windows PC — what to actually scan, what settings to verify, and how to tell a genuinely clean machine from one that just looks fine.
No. Windows Security, built into Windows 10 and 11, is a genuine and capable antivirus when kept updated. The bigger risk is the 'free antivirus' download sites themselves, which are a common malware source — stick with what is built in or a known major brand.
Real signs: a browser homepage you cannot change, toolbars and pop-ups everywhere, a PC that is slow with the disk pegged by an unknown process, or ransomware notes on files. If a scan finds nothing and the symptoms persist, run the slow-PC tool — not every problem is malware.
Disconnect from the internet, run Windows Security's offline scan, and only if that fails consider a reputable second opinion. Never pay a 'tech support' cold caller or click pop-up numbers — those are scams layered on top of whatever you found.
Every tool answers instantly from our own knowledge and calculators — no AI wait, no account. Honest maths and plain guidance, always educational and never pushy about buying new gear: repair, upgrade, backup and security decisions explained in language a human actually uses. Results are estimates and guides, not guarantees, and nothing you type is stored. Want the deeper, personalised version? Each has a $2.95 full report.