Download & Install Trojan Killer

Download & Install Trojan Killer

Option A — Standard installation 

  1. Download
    Get Trojan Killer from our official download link.

    Trojan Killer download page with browser showing the downloaded installer in the top bar

  2. Open the installer
    Double-click the downloaded file and approve the Windows prompt (UAC) to continue.

    Windows UAC prompt for Trojan Killer Web Installer with Yes button

  3. Choose setup options
    Select the install location and (optionally) create a desktop shortcut, then click Install. Agree to the EULA

    Trojan Killer Setup Wizard with install location and Install button

  4. You can also read the EULA on our website.

    Trojan Killer Portable Setup installing screen with EULA link highlighted

  5. Click Finish. You can auto-start Trojan Killer right after setup. On first run, let it update the threat database.

    Trojan Killer Portable Setup completion screen with Start Trojan Killer checked and Finish button



Option B — Use the Portable Edition (no installation)

Use this when the PC is restricted, heavily infected, or you prefer to run from a USB stick.

  1. Prepare on any clean PC
    Download Trojan Killer and place (or install) it onto a USB flash drive. 


  2. Plug into the target PC
    Connect the USB and launch Trojan Killer directly from the USB—no installation needed. 

    Windows File Explorer on USB drive launching Trojan Killer executable

  3. Update & scan
    Start Trojan Killer from the USB, update definitions if you’re online, then run a scan and follow on-screen actions. (A restart may be required to finish removals.) 





System requirements

Windows 11/10 (32/64-bit)

Info

Legacy compatibility:
Runs on Windows 8.1/8. Many shops and legacy PCs still need malware cleanup. Trojan Killer can run on Windows 7/Vista/XP too, with reduced features on those unsupported systems.

Why: Microsoft no longer supports 8.1/8 with security updates, so we keep them as “works if you need it,” not primary targets.

  • Official source: Always download from Gridinsoft domains. 

  • Digital signature: In Windows, right-click the file → Properties → Digital Signatures to confirm it’s signed by Gridinsoft LLC. 


Activate your subscription

If you already have a code or license, follow the activation guide after installation/first launch. 


If the installer won’t start

  • Run as administrator: Right-click the installer → Run as administrator.

  • Temporarily pause other security software: Some products block third-party installers. Resume protection after install.

  • Try Portable Edition: If downloads or installers are blocked, prepare the USB on a clean PC and launch it on the target machine. 


    Glossary (A–Z)

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