Are you sure you renamed your ssl.crt folder to ssl.crt.old and created a new one manually? I think the command is trying to create the new files with the same name and is unable to overwrite your old ones which should not be there.
I did. Actually I found the solution by myself. I was not running cmd.exe within administrative content. Although the user context was an administrator.
For anyone who is searching for a solution on german, I decided to post the solution on my blog together with a related problem. The Error=401 error.
Hope it helps anyone who will have the same problem :-)