It might seem logical that antivirus companies would offer free antivirus protection as a kind of loss leader, with only the most basic protection. Getting the advanced bonus features would require becoming a paying customer. But actually, many of the most popular free antivirus tools offer full-scale protection and a ton of extra features. Avast Free Antivirus gives you more than many competing commercial products. On top of excellent antivirus protection, it adds a network security scanner, browser protection, and more. It's an impressive collection of security tools—especially considering that it's free.

If you look in the menus for Avast Antivirus, you will not find any option to close or exit the program. In fact, even if you try to force-close the program, you will not be able to do so in the Task Manager. Avast, by default, enables an anti-disabling mechanism to keep malware from closing the software before infecting your computer. If you want to close Avast -- either to troubleshoot the antivirus software or to install a different anti-virus program on your business computer -- you must first turn off this mechanism.
How to temporarily disable Avast: 3 steps
Deactivating Avast entirely means you’ll be left with no protection; it’s like having no antivirus at all. That’s great if you’re having trouble opening a certain file (that you’re sure isn’t malware), but it should be used temporarily and sparingly. Here’s how to pause Avast antivirus:
Step 1: Right-click the Windows Taskbar icon
Step 2: Accept the warning
Step 3: Retry the blocked action
How to Disable Avast Shields?
You can also disable Avast shields instead of close Avast. Thus, it won’t take a long time to open Avast again.
1. Right-click the Avast icon.
2. Select Avast shields control.
3. On the expanded menu, you can select one option as per your requirements.
4. If you want to enable Avast again, you can right-click the Avast icon and then go to Avast shields control > Enable all shields.
Reading here, you should know how to close Avast on your computer.
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