Windwos PowerShell Host initialization crash

Hi,

I've installed a fresh Windwos 8.1 Enterprise.

After installing Visual Studio 2013 with Update 2 I'm unable to start PowerShell. I've noticed powershell is not running after trying to initilize the package manager console within VS2013. 

Within the event viewer I only found this record about the exception.

Eventname: PowerShell
Answer: Not available
CAB-File-ID: 0

Problem signature:
P1: powershell.exe
P2: 6.3.9600.16394
P3: System.BadImageFormatException
P4: System.BadImageFormatException
P5: ment.Automation.Internal.PipelineProcessor.Dispose
P6: ment.Automation.Internal.PipelineProcessor.Dispose
P7: Pipeli..ution Thread
P8: 
P9: 
P10: 

I can't figure out what's wrong... cause it's fresh installation... I got the same working setup on my Windows Server 2012 R2 Development machine..