Same thing is happening when opening any MS 2010 application in Windows 7.
For the meantime, I will be uninstalling Avast until a fix is generated.
Problem signature:
Problem Event Name: APPCRASH
Application Name: WINWORD.EXE
Application Version: 15.0.4745.1000
Application Timestamp: 55a4b990
Fault Module Name: StackHash_2408
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 00000000
Exception Code: c0000005
Exception Offset: 0000000077340017
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 1033
Additional Information 1: 2408
Additional Information 2: 2408750e837eda6353562d171ea2d88a
Additional Information 3: ee29
Additional Information 4: ee29ee1583cdd30f2fe3b1680e2e7107