Dell lap top so slow I am going nuts!

[gullrock]

My laptop of 3 years is so slow starting that i can make a cup of tea do 2 slices of toast and then still have time to eat it before I can do anything on my laptop!! What is the best way of clearing all the collected rubbish and make it work like new please?

 

[KungKarlXVI]

do a factory reset and remove everything except windows and dust clean it as it may be throttling (the processor get so warm that it slows down to prevent overheat damage)