What is definst.exe?

Originally developed by Symantec Corporation, definst.exe is a legitimate file process. This process is known as Norton Virus definition Installer and it belongs to Norton Systemworks. It is located in C:\Program Files by default.

definst.exe virus is created when malware authors write virus files and name them as definst.exe with the aim to spread virus on the internet.

Affected Platforms: Windows OS

How to determine if your computer is infected with definst.exe malware?

Look out for these symptoms to check if your PC is infected with definst.exe malware:

• Unstable internet connection
• definst.exe occupies extra CPU space
• PC processing speed slows down
• Browser often redirects to irrelevant websites
• Browser is bombarded with hordes of popup ads
• Computer screen freezes repeatedly

Take the following steps to diagnose your PC for possible definst.exe malware attack:

Step 1: Simultaneously press CTRL+ALT+DEL keys to open Task Manager.

Step 2: If you notice the file located outside C:\Program files, perform an antivirus scan to get rid of the malware.

How to remove definst.exe malware from system using Comodo Antivirus?

Step 1: Download our award-winning Free Antivirus. 

Step 2: Installation configuration frames will be displayed. Select the configuration you would like to apply.

Step 3: Select Customize Configuration option and arrange installers, configuration, and file location.

Step 4: Restart your PC after the installation gets over

Step 5: Wait for Comodo Internet Security to update the antivirus.

Step 6: Proceed with the quick scan that automatically begins after the update.

Step 7: If threats are found during the scanning, you will be notified through an alert screen.

Step 8: Comodo Antivirus will remove definst.exe malware from your computer including all other malwares!