更新后，windows defender文件夹下definition updates占了大量磁盘空间

fort (fort) July 20, 2026, 12:21pm 1

今天新电脑到货，更新系统后发现400g的c盘被占满，使用wiztree发现是安全中心搞的鬼，开安全模式删光，然后关掉defender了。最近这个bug似乎又出现了，以前也有人遇到类似问题：
Definition Updates占用了C盘55%的空间 - Microsoft Q&A

"C:\ProgramData\Microsoft\Windows Defender\Definition Updates"这个文件占用了c盘160g的空间，并且我没有权限删除，那我应该怎样解除占用？ - Microsoft Q&A

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