It started a bout 2 weeks ago, maybe longer. For what ever reason everything was working as it should yesterday but today slow again. WMP, Apple QuikTime, any wav or mp3's, Groove3 player, Ask video player and Streamed videos from ASKaudio. I have had Win10 for about 6 months. This is my DAW comp so not always connected to the internet. I have checked speed under enhancements in WMP and is at normal 1.0 speed. I am at a loss on this. My internet comp is on Win10 also and no problems there. I do have Sonar installed there but is started up not even once a month. Any help will be appreciated.  

I am trying to imagine what "running at half speed" would be like, and have no clear idea what you are talking about.
 
Are you saying that the music played by your other audio applications is playing slowly? Is it exactly normal speed/2 or is it some other fractional multiple of normal speed? Is the pitch altered as well? Maybe a mismatch between the sample rate set in your audio interface and the one used by the applications? Are the audio applications and Sonar using the same audio interface?
 
Check the Sound Devices menu in control panel and see if changing the sampling rate for the appropriate audio device to 44.1K fixes the problem. If Sonar is playing normally, then likely your audio interface is matching the project sample rate, but the other applications do not follow the audio driver SR.

Audio in music and audio and video in any videos all play slow. Typical funny sounding low pitch. If you had an old tape player with a few speeds and recorded at the high speed and played back at a slower speed. Pitch is altered.

Is this only with your interface or with your onboard sound card as well?

Yeah, this sounds like a problem with your audio interface.  I've had problems with distorted sound before, and usually it means the audio interface is busted or the drivers are corrupted.  For slowed down audio, this might have something to do with bit rate.  You might have the bit rate settings at a higher level than the interface can handle.  Turning that down might do the trick.
 
If the problem persists with your built-in sound card, then ignore everything I just said.

Thanks for your help and interest guys. I know this sounds like a made up problem. I actually put off posting about this until April Fools day was in the rear view mirror. I went back and looked how I was setting up before Windows 10 and in Control Panel I had my Focusrite Sapphire as the default and my Focusrite VRM box and the second one (Communication device or something like that. I rebooted and it was working now. But it will need to work right for a few days before I will say it's solved. I believe it is related to a Windows 10 update from a few weeks ago. I have no proof but others were having trouble after that. My system wasd OK before that so something had to change. I'm going to watch this for a few day and see how it goes.

it sounds like a sampling rate issue.  windows might have had sampling rate set to 48k when your sapphire was set to 44.1