What is AVShellExt.dll?

AVShellExt.dll is a Windows DLL file. DLL is the abbreviation for Dynamic Link Library. DLL files are needed by programs or web browser extensions, because they contain program code, data, and resources. The following information can help you determine if AVShellExt.dll is a Windows system file or if it belongs to an application that you can trust.

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AVShellExt.dll file information

The process known as Windows Live OneCare AV Shell Extension belongs to software Windows Live OneCare or Microsoft Windows Live or Microsoft Windows OneCare by Microsoft (

Description: AVShellExt.dll is not essential for the Windows OS and causes relatively few problems. AVShellExt.dll is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 34,176 bytes (30% of all occurrences), 37,928 bytes, 30,952 bytes, 31,024 bytes or 34,664 bytes. 
A .dll file (Dynamic Link Library) is a special type of Windows program containing functions that other programs can call. This .dll file can be injected to all running processes and can change or manipulate their behavior. The program has no visible window. The file has a digital signature. The service has no detailed description. It can change the behavior of other programs or manipulate other programs. The AVShellExt.dll file is not a Windows system file. AVShellExt.dll appears to be a compressed file. Therefore the technical security rating is 56% dangerous.

Uninstalling this variant: In case you experience problems using AVShellExt.dll, you may also uninstall the software Windows Live OneCare or Microsoft Windows Live using the Uninstall a Program function of Windows Control Panel (Windows: Start, Settings, Control Panel, Uninstall a Program).

Recommended: Identify AVShellExt.dll related errors

Important: Some malware camouflages itself as AVShellExt.dll, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the AVShellExt.dll process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


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Best practices for resolving AVShellExt issues

A clean and tidy computer is the key requirement for avoiding problems with AVShellExt. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the AVShellExt.dll process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

AVShellExt.dll [all]