Can you just change the processor?

i have a celeron D 3.46GHz and i want to change to an Intel Pentium D 805 2.66GHz Dual-Core OEM Processor. (both socket 775) how do i do this? would i spend any additional $$ besides the processor|||If they are the same socket then you should be fine. Your only additional cost would be a thermal grease which you need to learn how to use it before you change out your processor.|||It wouldnt have any affect on running windows if you changed ur CPU. I dont believe you need to spend extra cash if you already bought the CPU|||Well this would really depend on your motherboard and if it would support your new processor. You should always check that out first before you purchase a processor because you may need to purchase a new motherboard and if thats the case you might as well build yourself a whole new computer. Hope that helped!|||Dear friend, If u r motherboard support the processor pentium D,(It has the same pin number on the socket) u can easily sell u r old processor and by PD processor and fit on it. If u r board does not support this processor u want to change u r mother board also