resets an environment variable to what it would be if you opened a new prompt

resetEnv.ps1

function resetEnv {
    Set-Item `
        -Path (('Env:', $args[0]) -join '') `
        -Value ((
            [System.Environment]::GetEnvironmentVariable($args[0], "Machine"),
            [System.Environment]::GetEnvironmentVariable($args[0], "User")
        ) -match '.' -join ';')
}

console - Reload the path in PowerShell - Stack Overflow
https://stackoverflow.com/questions/17794507/reload-the-path-in-powershell/56033268#56033268