What I found on the MS site:
Cause
This error occurs when an application abnormally terminates itself or is unexpectedly terminated by another application, thus causing an access violation. Windows NT Error Code 87 occurs when Dr. Watson loads to log the error, but the process is shut down before Dr. Watson can access it to gather debug information.
Because Dr. Watson does not attach itself to the application, no debugging information is available in the log file.
This error is not the result of Windows NT closing down the application.
???? Still not sure what caused it to crash...