A few days ago i bought a celeron 433 and i wanted to overclock it.. it tried 6.5x73 this worked ok.. so i went on i tried 6.5x83 it still worked ok but after a few hours i wanted to reboot windows and i got a explorer error i rebooted again and i still got the error than i set the fsb to 73 and it worked ok again... what did i do wrong?

sorry for this stupid question but this is the first time that i try 2 overclock my cpu... and sorry for my bad english

my hardware: a asus p2l97 flashed with the newest software a celeron 433 a fujitsu hd and a quantum fireball pci66 ram