For a long time my windows 7 Dell laptop has been running incredibly slow. It takes forever to start up (where it brings you to your desktop and loads the programs) it takes too long to open up chrome or firefox (not to mention, whenever i'm using firefox or chrome, it lags so much and it takes forever for me to type in whatever I want to type in.) it takes a while to load pages sometimes, and my whole computer is just slow. I tried scanning it for viruses, but apparently there aren't any viruses. Im not sure if this might be the problem, but I have 91.7 GB left out of 284 GB. I don't think thats the problem because my desktop computer is so low on GB, yet its faster than my laptop and able to load up things quite faster sometimes. My computer specs are:
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What exactly could the problem might be and how can I fix it? Thanks for helping :)

What exactly could the problem might be and how can I fix it? Thanks for helping :)