Already did that Mr P didn't understand what they were rabbiting on about,or indeed nowt why would want to lock or unlock cores one likes to hear things explained in simple terms.
Many years ago one built a dual cpu Pentium 2/3?machine with the idea it would be swift ,sadly there weren't any progs then that would run than multi threaded ie used both cores. cost a bloody fortune as well.
Ere disregard the above Gents, according to task manager I already have four cores working on my behalf.