You should be able to go into the BIOS and "enable all cores", save and reboot. If that doesn't fix the issue then you will need to install a Windows hot fix as listed below.
Read the Hot fix details so you understand what it does and that you have the correct updates, etc. installed.
Alright thanks, did both of those and now all six of them are running and my computer is going faster than it was with only 4.
Thanks for the help