WindowsError: [Error 2] The system cannot find the file specified

I keep getting this error
 Traceback (most recent call last):
File "C:/Documents and Settings/dolamite/Desktop/reg.py", line 4, in <module>
    aKey = OpenKey(aReg, r'SOFTWARE\SEMS_Event_Managment')
WindowsError: [Error 2] The system cannot find the file specified

from _winreg import *

aReg = ConnectRegistry(None,HKEY_LOCAL_MACHINE)
aKey = OpenKey(aReg, r'SOFTWARE\SEMS_Event_Managment')
expiration = QueryValueEx(aKey, "Expiration")
print expiration
CloseKey(aKey)

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I am trying to get the expiration date from the registry

the exact location of the registry Im trying to locate is
My Computer\HKEY_LOCAL_MACHINE\SOFTWARE\SEMS_Event_Managment

Expiration

what am I doing wrong ?