# Error: You are receiving the Error [-51] / [-52] message
Fix: You need to delete the certificates and re-activate the game
1) On receiving the error, please uninstall the game
2) Please navigate to the following directory:
XP users: C:\Documents and Settings\All Users\Application Data\Sports Interactive\Football Manager 2009 Certificate
Vista users: C:\Program Data\Sports Interactive\Football Manager 2009 Certificate
3) Please ensure that it is the \certificate directory you are located in
4) Delete all content
5) Reboot the machine
6) Re-run the installation program and retry activation - ensuring you have 'verified' your key using the following website:
http://keylookup.fm2009.softanchorinsight.com/7) You should now be activated
Note: If the above does not fix it – please check the following:
C:\Documents and Settings\All Users\Application Data is not set to read only.
Also check that C:\Documents and Settings\All Users\Application Data\Sports Interactive and C:\Documents and Settings\All Users\Application Data\Sports Interactive\Football Manager 2009 Certificate are not set to read only!
To check if a file or folder is read only, please right click the folder and select 'Properties' from the dropdown, you should the see a box at the bottom called Attributes – please ensure this is unticked or does not have a green square inside.
Another way it could happen is if there is another instance of FM.exe or Activator.exe holding onto our certificate. In this case - the user should check the process list to see if another instance of FM.exe is open. If so - close it first.
To do this you need to open Task Manager (right click TaskBar, or CTRL+ALT+DEL), sort the Image Name column by clicking on it and identifying if Activator.exe or FM.exe are running. If they are highlight and click 'End Task'
