"IRQL NOT LESS OR EQUAL" Serious Error Message Appears During Startup

You installed the latest Symantec Event Manager (SymEvent) update on your Windows XP computer. When you restart the computer, you see a blue screen with the message:

This was caused by a problem with the downloaded update file. The problem has been fixed, and a new SymEvent file is now available through LiveUpdate.

To resolve this problem see Symantec Knowledge Article: Error: "ErrorMessage: IRQL_NOT_LESS_OR_EQUAL STOP. . ." occurs after installing the Symantec Event Manager Driver on Windows XP (In English)