It won't open another windows, the result will be displayed on the screen as long as you start the command from a window. If you just type in systeminfo in the Run field, it will run but dissapear. You need to scroll up or down to see it the language settings unless you have the command window larger than default.
What are you trying to use this info for? If for a script, you can use vbscript or even a batch file redirect (> arrorw) and send the output to a text file.