windows defender程序无法检查定义更新，错误代码 0x80080005，并且安全中心无法更新windows defender定义，请问如何解决？
您好，
您的windows defender问题应该是由于您的Windows Update无法启动所致， 所以建议先解决您的Windows Update问题，
您的Windows update无法启动，提示找不到指定模块，
这个问题应该是由于Window update的注册表存在问题所致，建议您可以通过导入注册表来解决您的问题。
首先，将您原来的注册表导出，步骤如下：
1. 单击开始按钮，在搜索框内输入regedit，按回车键。 2. 在注册表编辑器中，依次展开至
HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Services\\wuauserv，右键wuauserv选择导出，单击左侧窗格中的桌面作为保存路径，输入regbackup作为文件名，点击保存。 然后再导入注册表，注册表导入步骤： 1.创建一个文本文档
2.将以下代码粘帖到文档中：
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\\SYSTEM\\ControlSet001\\Services\\wuauserv] \
\
\\\ 74,00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,73,\\ 00,76,00,63,00,68,00,6f,00,73,00,74,00,2e,00,65,00,78,00,65,00,20,00,2d,00,\\ 6b,00,20,00,6e,00,65,00,74,00,73,00,76,00,63,00,73,00,00,00
\\\\
\\
\\
\\\ 00,69,00,76,00,69,00,6c,00,65,00,67,00,65,00,00,00,53,00,65,00,43,00,72,00,\\ 65,00,61,00,74,00,65,00,47,00,6c,00,6f,00,62,00,61,00,6c,00,50,00,72,00,69,\\ 00,76,00,69,00,6c,00,65,00,67,00,65,00,00,00,53,00,65,00,43,00,72,00,65,00,\\ 61,00,74,00,65,00,50,00,61,00,67,00,65,00,46,00,69,00,6c,00,65,00,50,00,72,\\ 00,69,00,76,00,69,00,6c,00,65,00,67,00,65,00,00,00,53,00,65,00,54,00,63,00,\\ 62,00,50,00,72,00,69,00,76,00,69,00,6c,00,65,00,67,00,65,00,00,00,53,00,65,\\ 00,41,00,73,00,73,00,69,00,67,00,6e,00,50,00,72,00,69,00,6d,00,61,00,72,00,\\ 79,00,54,00,6f,00,6b,00,65,00,6e,00,50,00,72,00,69,00,76,00,69,00,6c,00,65,\\ 00,67,00,65,00,00,00,53,00,65,00,49,00,6d,00,70,00,65,00,72,00,73,00,6f,00,\\ 6e,00,61,00,74,00,65,00,50,00,72,00,69,00,76,00,69,00,6c,00,65,00,67,00,65,\\ 00,00,00,53,00,65,00,49,00,6e,00,63,00,72,00,65,00,61,00,73,00,65,00,51,00,\\ 75,00,6f,00,74,00,61,00,50,00,72,00,69,00,76,00,69,00,6c,00,65,00,67,00,65,\\ 00,00,00,53,00,65,00,53,00,68,00,75,00,74,00,64,00,6f,00,77,00,6e,00,50,00,\\ 72,00,69,00,76,00,69,00,6c,00,65,00,67,00,65,00,00,00,00,00
\\\ 00,01,00,00,00,60,ea,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00 [HKEY_LOCAL_MACHINE\\SYSTEM\\ControlSet001\\Services\\wuauserv\\Parameters]
\00,74,00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,\\ 77,00,75,00,61,00,75,00,65,00,6e,00,67,00,2e,00,64,00,6c,00,6c,00,00,00 \
\
[HKEY_LOCAL_MACHINE\\SYSTEM\\ControlSet001\\Services\\wuauserv\\Security]
\0,02,\\ 00,1c,00,01,00,00,00,02,80,14,00,ff,00,0f,00,01,01,00,00,00,00,00,01,00,00,\\ 00,00,02,00,48,00,03,00,00,00,00,00,14,00,9d,00,02,00,01,01,00,00,00,00,00,\\ 05,0b,00,00,00,00,00,18,00,ff,01,0f,00,01,02,00,00,00,00,00,05,20,00,00,00,\\ 20,02,00,00,00,00,14,00,ff,01,0f,00,01,01,00,00,00,00,00,05,12,00,00,00,01,\\ 01,00,00,00,00,00,05,12,00,00,00,01,01,00,00,00,00,00,05,12,00,00,00 3.保存该文档，将后缀改为 .reg 形式 4.双击保存的注册表文件便能完成导入。
希望我的建议对您有帮助！