Same problem, Media Core on AE loads and AE takes a dump. Premier and all video related Adobe software appears to crash when loading dll's associated with AE.
AE error log
Process: AfterFX.exe 
Path: C:\Program Files\Adobe\Adobe After Effects CC 2017\Support Files\AfterFX.exe
Product Version: 184.108.40.206
File Version: 220.127.116.11
Code Type: x64
Parent Process: Adobe Desktop Service.exe 
Date/Time: 2017-09-26 11:30:44 Central Daylight Time
OS Version: 6.1.7601.23889
Report ID: 0abefb43-a2d8-11e7-8986-9c5c8e7ca3b5
Time Awake Since Boot: 495 seconds
Crashed thread: 19  THREAD_PRIORITY_HIGHEST
Exception Code: EXCEPTION_ACCESS_VIOLATION
Exception Parameters: Access violation reading location 0x00000000f2c7ffff
Exception Message: 3221225477 The instruction at 0x
Application Specific Information:
Sorry for this issue. Did you ever find a solution? Please let us know if you have or if you still need help.
In a way, If I roll back the updates to 2015 for Muse and early 2017 for Prelude, Premier, and After Effect, they don't crash. After the 2017.2 update any Adobe software that handles video files will crash on start up due to an ATIO6XX.dll error. All I can figure is the Radeon internal graphics on my motherboard might not work with the newer updates. But never found a real solution besides using older versions. Would love a real solution.
Are you using third party plugins?? Some of them cause problems in the MediaCore if you are not using the correct plugin versions for CC2017.
I installed the previous version of After effects after this and had the same problem - then I uninstalled, restarted and installed the current version again and it worked.
Updated to 2018 and changed to a NVidia GT730 PCIe 2 video card.
Everything works now but still had to run muse as an administrator to finally get it running.
So I believe the newer programs that edit or use video need a different graphics card the my ATI onboard gpc set.
The reason I did this was because it dumped on the load of the ATIO6XX.dll.
With ATI gone everything appears to work.