Anytime I had an ArcMap 9.x related incident open with ESRI, they always had me do the usual steps of uninstalling extensions and tools, renaming the ESRI profile folder to ESRI_old, and renaming the ESRI registry key under HKCU to ESRI_old.
I am unable to find a list of arcmap.exe command line switches, but I feel like a /SafeMode type of switch would really speed up troubleshooting. The only command line switch I know of is /log.
Does anyone know of a /SafeMode equivalent or have a link to arcmap.exe command line switches?