"i also noticed that my cores when i manually core i noticed that my CPU has 5 cores which is 2nd core, 3rd core, 4th core, 5th core,and 6th core"
This makes no sense. There is no way a triple core CPU can have 5 cores. Where did you see this?
As skitz mentioned, chances are that your 4th core is faulty and cannot be unlocked.