I found that by typing it twice (type then enter, then type again) the System Restore window opens but it is blank, no options to do anything. Apparently my System Restore is not working either, nor is "Go back to the last good configuration (when system worked). Obviously, Microsoft has a great business: they put in features that don't work and we keep buying them. Can you imagine a bread baker who sells you bread but you can't eat the loaf, staying business?
c:\windows\system32\restore\rstrui.exe
That sould work on most systems.