The problem seems to have started yesterday (12-12-2011). Perhaps there was a bad update distributed via LiveUpdate? My NIS 2012 is version 19.2.0.10 (on Win7-64bit). When I disable the "Norton Vulnerability Protection" add-on in IE9, Internet Explorer 9 runs just fine. When it is enabled, IE9 crashes on certain sites and must be closed. When the problem occurs, the Windows Event Viewer indicates a "jscript.dll" fault in "iexplore.exe" (i.e. IE9).