Can i change my processor?

Some motherboards do support both Intel Celeron and Intel Core 2 Duo processors, without any information on your computer make and model number, or motherboard, cannot say for sure. If you needed a new motherboard, you're probably looking at rought $80-100 for motherboard, $60-75 for processor, and then some more for RAM if that needs to be changed. It's a lot of work, and if you don't have someone knowledgeable to do the work for you, you could be looking at a big paper-weight at the end of it.