Prepar3d V4.5 Keeps crashing

[king1706 1]

can anyone see why my prepar3d keeps crashing from the below log I appreciate any help 

Description
Faulting Application Path:    C:\Program Files\Lockheed Martin\Prepar3D v4\Prepar3D.exe

Problem signature
Problem Event Name:    APPCRASH
Application Name:    Prepar3D.exe
Application Version:    4.5.13.32097
Application Timestamp:    5d8abf93
Fault Module Name:    nvwgf2umx.dll
Fault Module Version:    26.21.14.3615
Fault Module Timestamp:    5d62062d
Exception Code:    c0000005
Exception Offset:    0000000000ccd5a7
OS Version:    6.1.7601.2.1.0.256.48
Locale ID:    1033
Additional Information 1:    0372
Additional Information 2:    0372bb655df1e4e5412bc5f6b1071faf
Additional Information 3:    e5cd
Additional Information 4:    e5cd1e5cecf816bf529885dc9af13c7c

Extra information about the problem
Bucket ID:    3284776268
Thanks a lot 

amr guindy

[FDEdev 955]

If you type 'nvwgf2umx.dll' into the google search page you will find quite a few tips how to solve this problem.