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I don't have Windows 10 (7 here) so can't say but jack was released before it came out so don't be surprised if you have issues running it.
Are you using the 32 or 64 bit version?
Have you regsitered the dll?
Have you confirmed jack control is running via command prompt?
You shouldn't be using the portaudio driver - I use Asio4All.
You can check the available asio devices by running the following command prompt in the jack folder:
jackd -d portaudio -l
I had it running ...for a short while ...then i made some changes... i am running the 64 bit version and there is a new GUI that shows available drivers in the setup box...so no need for the command line anymore . The dll is registered although in the latest setup there is no need for that anymore, to be save i did it manually also.
I did a reinstall and the only way I found to emulate your problem of it not starting in the message log is by not opening Jack NetDriver prior to the Jack Control. You may just want to reinstall and keep a tab on the changes you did (assuming you haven't done this already).
Other than that I can't change individual settings sample rate/buffer time. I've tried in the shortcut and from Jack Control shortcut but it still stays at default, maybe you guys had better luck there. I have some more tinkering to do I suppose.
Edit: Got it to work so I'll post the steps/settings since its fairly finicky.
Uninstalled and reinstalled in full as well as unregistering and reregistering the server in cmd.
Before opening Jack control:
-In the Jack PortAudio shortcut in the target: "Your install directory\jackd.exe" -R -S -d portaudio -d "ASIO::Your driver" -r samplerate -p bufferrate
-Go to JackRouter config file in 32bits and 64bits edit those you your liking. I did both but they may not need to.
[IO]
Input=number input channels you want
Output=number output channels you want
float-sample=0
[Auto_Connect]
input=1
output=1
alias=1
-Opened Jack Port Audio
-Opened Jack Control
In Jack Control my settings that portaudio allow
Server Prefix: jackd -S
Name: default
Driver: portaudio
Realtime: check
Interface: default
Frames: 256
Dither: None
Sample Rate: 48000
Audio: Duplex
Input: Default
Output: Default
Channels:24
Channels I/O: 12,12
Port Maximum: 256
Latency I/O: Default,Default
Under Display Tab
Transport Time Code
Enable client/port aliases: check
Enable client/port aliases editing: check
Jack client/port aliases: Changed to Default from second
Misc Tab
Start JACK audio server on application startup: check
Stop JACK audio Server on application exit: check
Save JACK audio server configuration to: .jackdrc
Confirm server shutdown: check
Hopefully this can help you out. This is just my routing of Traktor to Ableton but I'm sure your connections shouldn't pose that much of a problem.