My HP laptop keeps overheating, how can I fix this?

You can take it to a computer shop to check out the fans... clean them etc. If they find out that the fans are broken get them fixed or get an external fan they're not overly expensive, 10-25 quid, and get a chill-mat.

Seriously, I would recommend using a chilmat underneath the computer. chilmats come with fans which allow better ventilation for laptops. If your computer does not stay kool after using the chilmats then there is something not right with the heatsink on the processor. Probably the whole processor and the heatsink needs to be replaced.

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Yes, although I am not familiar with your specific laptop, in general you can safely remove a panel from the bottom to access memory for upgrades etc. and through this you can see a bit how much dust has accumulated. I am thinking that dust is most likely the reason. I read somewhere that human skin cells make up 90% of all household dust. They tend to contain a bit of oil and will stick to your components like glue, so that the cleaning from 6 months ago probably did not restore it to new condition, but just brushed away the fluffy stuff with a dry brush. You can safely take the whole thing apart, but there are usually hidden latches/tabs that you might break if you are not familiar with the case. Before touching the components, it is a good idea to use a grounding wrist strap, keeping yourself in contact with the case so that there are no sudden static discharges into the components. It's also good to ground the case or at least give it some time to discharge after you unplug it and remove the battery. You will need the appropriate size screwdriver. It will take a lot longer to do this if you try to just make do, plus you will risk damaging the screws. If you use this as a desktop replacement only, then you could just put a desktop fan blowing on it as a temporary measure. But obviously if you like to take it around with you, that will not work. I do this with mine. Again, if this is a desktop replacement, you can look into converting it to a water cooled design. It involves soldering a short length of copper or aluminum tubing to the heat sink and connecting vinyl tubing to that to circulate water using a fountain pump through an aquarium or desktop water feature. This won't be very portable though. If you need it to be portable, the best solution is to take it apart and clean it. You can do this yourself or hire a college student to do it for you. You can use distilled water since pure H2O does not conduct electricity and will not leave anything behind when it evaporates. If you shop at Kroger, it should be the one with the red cap. You can use a lot of cotton swabs, so get a big pack of those too. Don't submerse your computer or use soap of any kind. Just dampen the cotton sticks and scrub, then use another cotton stick to mop up any moisture. I don't recommend compressed air, as that has potential to do more harm than good. When taking your computer apart, make sure you don't lose the screws. Set up a work space and if possible video how you take it apart so you can remember how to put it back together. It should make for an amusing video regardless. Sometimes a screw will be a different size, but it won't be obvious, so it's best to label each screw and put it back exactly where you got it. I just do this on the dining room table and use tea cups and a draw a diagram labeling each screw with a letter and I write the letter on the tea cup with a dry erase marker.