Okay,thanks.

I noticed french in your screenshot,so if this is hard to follow,or you're unsure on anything,please let me know first.
How about you make two registry backups,just to be on the safer side of things.
Go to Start,type regedit,and doubleclick it.Say yes if prompted by UAC.
Navigate to HKEY_LOCAL_MACHNE\SYSTEM\CurrentControlSet\Services\Eventlog\Spybot - Search and Destroy
Please refer to this link on how to backup a registry key:
http://pcsupport.about.com/od/windows7/ht/backup-registry-keys-windows-7.htm
Please backup the Spybot - Search and Destroy key.
Now go back and also back up the Eventlog key the same way.
Next,go back to Navigate to HKEY_LOCAL_MACHNE\SYSTEM\CurrentControlSet\Services\Eventlog\Spybot - Search and Destroy,rightclick Spybot - Search and Destroy and select Permissions.See if the username that you are installing with has full control.
Now,go back to HKEY_LOCAL_MACHNE\SYSTEM\CurrentControlSet\Services\Eventlog\,rightclick Eventlog and select Permissions.See if the username that you are installing with has full control.Please post back what you find for permissions in both keys,but do nothing yet.
Also,you are installing from an administrator account?