Error message "can't start because rxspencer.dll is missing"

Problem signature:
Problem Event Name: APPCRASH
Application Name: zeus.exe
Application Version: 3.97.86.0
Application Timestamp: 5131967d
Fault Module Name: StackHash_2264
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 00000000
Exception Code: c0000005
Exception Offset: 01f3b530
OS ...