Sometimes, because of reasons such as computer viruses or malware will cause the system environment variables to change, and even lead to many application errors or fail to start.So, in this case, we must restore our default environment variables settings of windows 7.

However, we do not know what is the default Windows 7 environment variables, and how shall we add the default environment variables to the system settings?

Here is the windows 7 default list of environment variables, just need the environment variables in this list can be added to the system.

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