I recently acquired a windows xp box, and installed sfc op on it. I then tried to run it, the cd key verification screen came up, and when I tried to type it in before and after putting the cursor in the input field box, the box consistantly refused to accept any input, staying blank. On the chance that the cd key verification had been disabled, I pressed enter. The error, CD key is incorrect text came up. Does anyone have a work around?