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When trying to open an ArcToolbox tool or open the Environments on the Tools > Options > Geoprocessing tab, the following or similar error message(s) is displayed:
"A Runtime Error has occurred.
Do you wish to Debug?
Error: Syntax error"
One possibility is that one or more MS XML .dll files are not properly registered.
Manually re-register the msxml.dll, msxml2.dll and msxml3.dll.