Do you have some other program that uses CTRL-SHIFT-C as a hotkey? Do a search here, as I'm sure this problem been mentioned a couple of times recently.
Just found out this morning that a recent update from HP introduced the command line for HP Health, thus knocking out the Sims command line. For anyone who wants to know, the command line can be accessed by using Control+S+windows key+C. Another facroe that knocks out the command line, from others assisting in finding the answer to this, saay that CursorXP will do the same thing.
Thanks for replying.