To add/remove or edit Environment variable in windows 7 follow these steps:

• Go to Control Panel
• Click on System and Security
• Choose System
• Choose Advanced System Setting in the left side bar

• In this System Properties window select Advanced tab and click on Environment Variables

• In  Environment Variable window you can see User defined and System defined environment variables. You can Add/Remove or Edit the User variables. To Add click on New, to remove select the variable and click Delete and to edit an existing variable select the variable and click Edit.

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