Download Microsoft Security Essentials 2.1.1 for Windows

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您可以安全且完全免费地下载每个先前版本的 Microsoft Security Essentials XP。

Updating Security Essentials or Defender still won’t be possible, because no more updates exist. However, once manually installed, these definitions can always be used to scan your PC for malware.

如果要我推薦可以在Windows XP、Windows Vista和Windows 7中使用的「免費」防毒軟體，如果您是「原版」的作業系統的話，我都會建議使用微軟自家的「Microsoft Security Essentials」防毒軟體，簡單、快速是我喜歡它的主因。 而沒有推薦在Windows 8安裝，是因為Windows 8的Windows Defender已經內建Microsoft Security Essentials了。

針對 Microsoft Security Essentials 更新病毒和間諜軟體定義的問題進行疑難排解。

Microsoft Security Essentials is a free download from Microsoft that is simple to install, easy to use, and always kept up to date so you can be assured your PC is protected by the latest...