Grab a cloth and wipe the visible dust off. Now, if you have been using your Computer more than a few months and you just have taken the components out for the first time you probably realised that they are very dusty. If you are a Computer user (Not a Laptop user) then you can begin with opening your Computer case and taking your Computer components out (Graphics Card, Ram, Motherboard etc - Make sure you know what you are doing, and take care with everything you are doing to avoid any equipment being destroyed!) Once you have taken everything out of your case, lay it some where FLAT. Trust me, that this is not a good idea, everyone should take care of their Computer components to make sure they work the best. Let's be honest here, when was the last time you took some real time to clean the inside parts of your Computer or Laptop? Some people might have not done it before.