I tried Netgen 4.9.11 on a simple STL file and it crashed.

Problem signature:
Problem Event Name:    APPCRASH
Application Name:    netgen.exe
Application Version:    4.9.11.0
Application Timestamp:    4aaaabd3
Fault Module Name:    netgen.exe
Fault Module Version:    4.9.11.0
Fault Module Timestamp:    4aaaabd3
Exception Code:    c0000005
Exception Offset:    000c1fee
OS Version:    6.0.6002.2.2.0.256.1
Locale ID:    1033
Additional Information 1:    fd00
Additional Information 2:    ea6f5fe8924aaa756324d57f87834160
Additional Information 3:    fd00
Additional Information 4:    ea6f5fe8924aaa756324d57f87834160

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Also the install on Vista x64 SP3 is broken in the presence of Account Control ON which is the normal case for Vista. It gives an error as indicated in the following picture:

Here is a ZIP file of all the files including the STL file that caused the crash.

Netgen_Crash_Gengon

Thanks,

Windy