how can i fix "invalid processor microcode update" i have a compaq dc7600 cmt C2C6260Q93

My m/c is a HP Compaq dc7600 CMT(C2C6260Q93).

 I've replaced the 2.8 processor with intel (R) pentium (R) D CPU 3.00 GHZ/4M , during start-up it gives the message "missing or invalid processor microcode update"

 My motherboard is HP (C) 2005HPDC can you help me to fix this problem ?

Thanks..