I have same problem...
I said that I tried re-installed and I used zip file but it had same problem.
When I entered my key, my DB just shut down and nothing.
Please, don't say re-installed...
please give me solution or new key... my freind's key is ok...
...
My DB shut down automatically, when I want to login.
After enter my key and put login, DB window is just disappear.
I don't know how I can solve.
I tried that I re-installed DB. But, it isn't work.