[SOLVED] 2 cores

Solution
That cpu has 2 modules that can process 2 threads each(4 total). Windows will report a cpu with 2 cores and 4 threads. You don't have to do anything this is normal.
Your processor has two cores and 4 threads.
That is what task manager is showing.
It is your graphics adapter that has the remaining 6 somethings, a bit misleading, I think.

What to do??
Nothing unless you need a stronger processor or graphics.