Laptop keeps making cracking noise?

It could be the hard drive. Is it too loud? If it's soft, it's probably the hard drive...

How can I fix it? Can i do it myself, and the noise is quite loud

Actually if it is the hard drive, then the only way you can fix it is to replace the hard drive itself. However if it's not the hard drive, you'd be wasting time doing anything in that area.
Can you give me the specs for your laptop?

Are you noticing any performance symptoms?
What laptop is it?
What does the noise sound like - just crackling? Louder towards a particular region or anything, or when doing particular tasks?

Is a HP Samsung Laptop have had it for over 3 years I think, It is louder toawrds the left hand side, its coming from the inside and just happens every 5-10 minutes, its like something is crackling and spammng my keyboard at the same time.

I'd probably get a new laptop if its had 3 years of heavy use. What I would do personally, if can afford to and it wasn't a super machine (assuming normal laptop).

Would probs have to take it into a repair shop for them to have a look.

Hopefully a computer sci person will come to your rescue and diagnose it.

From my limited knowledge, and as others have said, the moving parts of the fans and the hard disk memory drive are likely to develop some problems after a long time of intense use (and maybe moreso in laptops, but not sure).

I'm not sure how those problems could result in a spamming of your keyboard though - would it not be suggestive of a different problem? (computer peoples)

I think you misunderstood, I said it sounds like someone is spamming my keyboard but it crackles as well.

Sorry!
My guess too would be the HDD memory failing.

oh no, but its not even my laptop, my uncle gave me it to boroow, he kept it for a 2 years and Ive had it for a year Probs just going to take it to a repair shop.