I get the same problem occasionally. Usually if you wait a bit it unties itself and gets you in, but sometimes you get the "SFC-OP not responding" thing if you hit Ctrl+Alt+Delete. What I would try is turning everything off that you can except your internet connection and the game (all other unnecessary applications off including anti virus)) and then try it. If it works well then there is some program interfering with the game. You can then narrow it down by taking them out one by one until you find the culprit(s).