To start, don't use any of those crap programs to overclock. Manually adjust settings in BIOS ONLY.
You may need to clear CMOS, and uninstall all of those garbage overclocking tools.
Adjust CPU ratio in OS = disabled
OC Genie and all that crap = disabled
I don't have a 2500K, I have a 3570K, but you probably want to disable PLL overvoltage as well - research it.
Like I said those overclock programs are TRASH, please uninstall them and clearing CMOS may be neccessary to ever overclock.....