The MpAvDlta.vdm file contains the antivirus delta definition module. This file is usually updated multiple times per day by Microsoft and contains all the changes that have occurred since the last antivirus base was created. The MpAsBase.vdm file contains the antispyware base definition module.

Status. Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. Describes the symptoms of a data corruption problem that may occur on computers that have Forefront Client Security installed. Provides workarounds for this problem.

Symptoms. You experience the following symptoms when you are using Microsoft Forefront Client Security. Symptom 1. On a computer that is running Microsoft Windows 2000 Service Pack 4, the Anti-malware user interface cannot open when you log on to the computer by using a non-administrator account.

Improve Windows Defender baseline (engines, platform and security intelligence update) in OEM disk images using monthly updates and guideline to optimize during factory mode - Microsoft Support.

Forefront Client Security anti-malware client update: December 2009. This article describes the Microsoft Forefront Client Security (FCS) anti-malware client issues that are fixed in this hotfix package for Forefront Client Security.

Status. Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. Describes a hotfix rollup package that is available for the Forefront Client Security anti-malware client.

Microsoft has identified an issue in the Forefront Client Security agent on Windows 2000 which prevents the kernel-mode mini-filter driver, mpfilter.sys, from properly loading. This issue is specific to agents running on Windows 2000 and the Client Security October update and does not occur on other operating systems.

El archivo MpAsDlta.vdm contiene el módulo de definición de delta de antispyware. Este archivo normalmente se actualiza varias veces por semana por Microsoft y contiene todos los cambios que se han producido desde que se creó la última base de antispyware. El archivo MpEngine.dll contiene el motor de protección contra malware de Microsoft.

MpAsDlta.vdm文件中包含反间谍增量定义模块。 此文件通常由 Microsoft 更新每周多次并且包含创建的最后一个反间谍软件基以来发生的所有更改。 MpEngine.dll文件中包含 Microsoft 恶意软件防护引擎。 通过扫描寻找恶意软件的系统资源的恶意软件防护引擎引用前面提到的.vdm 文件。 系统资源的示例包括文件、 进程和注册表项。 此文件通常被更新每月一次。 Rebase 定义. 目前，Microsoft rebases 定义每个月只有一次。 重定基本值过程中，增量定义被结合以前的基本的定义文件，以形成一个新的基本文件。 重定基本值过程发生在防病毒定义文件和反间谍软件定义文件。 重定基本值过程中，新的基本文件的大小通常从上个月将增加。

O arquivo MpAvDlta.vdm contém o módulo de definição antivírus delta. Esse arquivo é normalmente atualizado várias vezes por dia pela Microsoft e contém todas as alterações que ocorreram desde a última base antivírus foi criada. O arquivo MpAsBase.vdm contém o módulo de definição básica do antispyware.