1, first in the start of the black screen, only the mouse case, through the CTRL+SFHIFT+ESC pull out the task manager;
2, click on the left side of the task Manager "detailed information", select the task management file → run new tasks;
3, then in the dialog box appears to select the lower right corner of the "Browse", pop-up file browsing window;
4, click on the left side of "This computer", select "Management", pop-up "Computer Management" window;
5, select the Local Users and groups on the left → users, on the right-hand side will list the users of the machine;
6, create a new administrator account, and then log off, with the new user name landing, everything is normal.