Go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileNotification
1. If a TDL key exists, right-click on it and select Export to back it up.
2. Right-click on TDL and select Permissions from the context menu.
3. Select Administrators under "Group or user names".
4. Check "Full Control" under "Permissions for Administrators".
5. Click on ok.
6. Delete the entire TLD key afterward.

Do the same thing with the following key.
HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows NT\CurrentVersion\ProfileNotification

You can not take permission of the key until you take permission of the parent key.