So, lately my computer has been running running SUPER slow. I can barely even open up the internet and post this. I already ran two MalwareBytes' Anti-Malware checks and found nothing. I am also downloading Paint.NET v3.5.9 and it is still downloading. I have waited about 3 hours so far.

Tell me what to do!

Has your computer been on all night and day? If so turn it off let it cool off. Have you checked if the computers inside has been cleaned? How much RAM do you got in the computer and space? Any viruses or trogans involved? Tell us.

I have this wonderful piece of software called ccleaner, this clears out all temp internet files you may have built up, cookies, and loads of other pointless stuff.This will clear the RAM, which may be causing your computer to run slow. I'm Not sure if its free as i got this and a lot of other software when i took my computer in to have it fixed one time, but if it is free, i urge you to get it.

Thank you all, I'm hoping to fix it soon enough!

open your task manager(cntrl alt delete) and post a screen shot of your processes with the cpu tab selected(highest cpu using tasks are listed).
Most likely you have a million useless processes running in the background slowing your computer down.

what are the specs of your computer?
ram?
processor speed/how many cores?
graphics card?