On Windows Vista, if the Digit Grouping section of Number Formats is changed in Regional and Language Options, the following error occurs when attempting to open ArcMap: "Problem signature:
Problem Event Name: APPCRASH
Application Name: ArcMap.exe
Application Version: 9.2.4.1420
Application Timestamp: 471917c5
Fault Module Name: AfCore.dll
Fault Module Version: 9.2.0.1323
Fault Module Timestamp: 452f339e
Exception Code: c0000005
Exception Offset: 0003186a
OS Version: 6.0.6000.2.0.0.256.4
Locale ID: 1033
Additional Information 1: caa8
Additional Information 2: 98799523de349a910bbdc9ba36f477a4
Additional Information 3: 5511
Additional Information 4: 2a421ddf5643e80dcb3a182e86e18937".
Click the 'Reset' button to restore the system default settings for numbers. This workaround may not be an option in some cases where a language other than English is used and English number formats are not used.