I have restored and updated my iphone 4 to ios 7.0.4 from itunes. Then I restored the backup that you previously made to retrieve settings, contacts, and others.
I installed as administrator for windows evasi0n application, and run it (also as administrator) closes automatically when the typical message "has encountered a problem and needs to close". So I can not give the jb. I have Windows 7 Home Edition SP1.
I searched google and have seen some cases that it was the same, but do not give clues or solutions.
Has it happened to someone else on the forum?