path变量修改后无法保存

Eclipse启动时出现错误：

A Java Runtime Environment (JRE) or Java Development Kit(JDK)

must be available in order to run Eclipse. No Java virtualmachine

was found after searching the following locations:

D:\eclipse\jre\bin\javaw.exe

javaw.exe in your current PATH

 

经网上查询需要修改环境变量，然后在修改path变量时，无论怎么修改都无法保存，再次打开的path变量仍是未修改之前的变量。网上有说要关闭360，但电脑并未安装360.

解决方法：在修改path变量时，关闭电脑自带的杀毒软件Windows Defender。