It's good that you can now rescue the emails.
I see Bob is helping also and that's great, but I have to be straight here. If you provide a file via Dropbox and we still cannot de-crypt it then your options become severely limited. I see now that the lock has affected other files besides your personal documents and I am assuming that these other files are going to make this OS unstable.
If so, then it is time to cut and run. Reformat that laptop drive and install the OS again as a fresh install.
For your information here's another link, a different example of Ransomeware;
That one is even worse as it seems the malware wasn't obtained via the usual methods but is actually installed by someone.
You might try BleepingComputer's forums, (available via the link above), or even Kaspersky's forums here http://forum.kaspersky.com/index.php?showforum=3 .
But frankly, if you intend to carry on with this, I am not at all sure forums are the best venue for you and you may have to consider removing the drive and sending it off to some expert data recovery service.