this exception is because security issue in Vista EventLog . how can i fix it ?

i have some C# code to make New EventLog and when i try to perform it and debug it a security exceptions is thrown after 1 day of searching i found some help saya that i have to go to HKEY_Local_Machine and then navigate to some folders till see eventlog and right click and the give it permessions and i done all that but the exception still exist any body have some idea how can i fix that