Used compressed air to clean out the vents on the computer.
Keep in mind there are many vents on the sides, rear, and bottom of the laptop.
Changing out the GPU and CPU, if it's possible at all, usually entails changing out the whole motherboard and isn't worth the trouble.
Often, the "upgrades" can cost more than a new laptop would. I'll have to check on your specific model (can you post the model # - the family, i.e.
We use recovery disks to get that done and its a really easy process.