Win 10 / 11 · Security

Skip paid antivirus — and keep Defender sharp

Most 'security suites' slow your PC down more than the malware they catch. The built-in defender is better than you think — if you switch it on properly.

  • Difficulty Easy
  • Estimated time 15 min
  • Platform Win 10 / 11
  • Last updated
Skip paid antivirus — and keep Defender sharp — schematic diagram

Before you start

Medium risk. This change is reversible — you can return to the previous state without professional help or data loss.

Steps

  1. Uninstall the suite first (win+r → appwiz.cpl) — while a third-party AV is present, Defender sits in passive mode, and two engines fighting each other leaves gaps
  2. Windows Security → Virus & threat protection → Manage settings → confirm 'Real-time protection' is on
  3. App & browser control → turn on 'Reputation-based protection' so sketchy downloads get flagged before they run
  4. Device security → Core isolation details → enable Memory integrity and the Microsoft Vulnerable Driver blocklist
  5. Run a Full scan once, then monthly; for a second opinion use Microsoft Safety Scanner or MSRT — portable, no install needed

How to verify the fix

Defender shows Real-time protection On with no third-party AV installed, and a full scan completes clean.

If this didn't fix it

Apps or games break after enabling Memory integrity — note which ones; disable that single setting if the conflict is unacceptable.

Next stop: the related fixes below, or start a guided diagnosis.

Related fixes

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