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in my case, I have used the system environment variable to export ROS_MASTER_URI you can use windows system variable to set the variable ROS_MASTER_URI

open the environment variable setting windows , windows start -> control pane -> system -> advanced setting

click New button, and put ROS_MASTER_URI as variable name, and put the http://localhost:11311/ as its value.

and open the new DOS terminal, launch roscore. roscore will be operated well.

good luck.