So I got the black screen cmd thing seen here and the only solution was creating a new user account. It's great an all to have it working, but it's not shown me what the issue was or how to solve it. I don't wanna just move everything over and have it happen again.
If creating a new user account helped you, your original one may have corrupt files (sometimes in the registry), or there may be a disk issue that has a fault in the area of the user files. Do a full disk scan with a utility like Seatools and see what comes up.