This page lists the most reliable free tools for disinfecting an infected Windows PC and for protecting a clean one.
No long instructions, no firmware rituals, no F-key roulette. Just the tools that work.
1. Microsoft MSRT (Malicious Software Removal Tool)
Already installed. Quick, safe, and worth running first.
Press the WIN+R keys > type MRT.exe > click the OK button.
2. Malwarebytes Free
Excellent at removing browser-based junk, adware, and PUPs.
3. ESET Online Scanner
Thorough, cloud-assisted, and safe to run after Malwarebytes.
1. Bitdefender Free
Best all-around free antivirus for normal users.
2. Avast One Basic
Strong protection, good lab scores, reasonable performance.
3. Avira Free Security
Lightweight alternative with decent detection and fewer nags.
4. Windows Security (Defender)
Already active; good baseline but often misses browser-based threats.
uBlock Origin
Blocks ads, trackers, and many malicious scripts.
Malwarebytes Browser Guard
Catches malicious sites, tech-support scams, and fake downloads.
EFF Privacy Badger
Learns and blocks trackers automatically.
If you have two working PCs, use the clean one to talk to your preferred AI while working on the infected one.
It gives you a second set of eyes, faster lookups, and safer decision-making.
If you have only one PC, run the tools above.
If the system won’t boot or malware blocks downloads, stop — you’ll need a second machine to create rescue media.