You have filled your laptop with unecessary programs, spyware, virusses, all kind of software crap that is filling up your main memory and diskspace. Your harddisk is probably very fragmented too.
All in all I think judging the tone of your voice, you dont know anything about PC's. These kind of people manage to somehow get their windows full of cpu/memory eating processes that basically degrade performance tremendously.
It's like basically people not fixing their car for a decade ; its rusty, the oil is empty, the filters are clotted, the tires are soft, the exhaust is noisy. All in all the car runs at HALF the speed because of poor maintenance.
Your pc is no different! Get some handy nephew to reinstall windows for you - backup your documents first. Only solution, imho.