Windows Defender Definition Updates by Windows

What is Windows Defender Definition Updates?

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Overview

How do I clean Windows Defender Definition Updates?

Windows Defender Definition Updates may store excess, temporary data on your computer that can take up valuable space. It may also store private data such as passwords or browsing history in the registry or on the file system. The easiest way to erase this data is by downloading AppCleaner, it is 100% free and about 1MB in size. A portable version is also available.

Clean Windows Defender Definition Updates
with AppCleaner

If you want to clean Windows Defender Definition Updates manually, you can follow the steps outlined below. There are two locations in the file system where Windows Defender Definition Updates stores data that can be cleaned.

Files

To clean your file system from files stored by Windows Defender Definition Updates and to gain free disk space, examine the following file system locations. First of all, open a command prompt window:

• Hit the Windows key , usually located in the lower left of your keyboard between the Ctrl and Alt keys.
• Windows XP/Vista/7: Click Run...
• Type cmd
• Hit Enter

Now list all the files stored by Windows Defender Definition Updates that can be cleaned:

1. Type dir /s %ALLUSERSPROFILE%\Microsoft\Windows Defender\Definition Updates\*
   • Windows XP: Type dir /s %ALLUSERSPROFILE%\Application Data\Microsoft\Windows Defender\Definition Updates\*
2. Type dir /s %LOCALAPPDATA%\VirtualStore\ProgramData\Microsoft\Windows Defender\Definition Updates\*
   • Windows XP: Type dir /s %USERPROFILE%\Local Settings\Application Data\VirtualStore\ProgramData\Microsoft\Windows Defender\Definition Updates\*

Once you have identified the files stored by Windows Defender Definition Updates that you want to clean, delete them using the del command or Windows Explorer.

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