My Computer Is Unbearably Slow But Not Infected

My computer seems to be very bogged down. Many programs freeze up and do the "not responding" thing and the internet constantly needs to have pages refreshed.I have malwarebytes pro on here, I have a regular defrag schedule, I uninstall programs that Im not using. Im not sure why its doing this. I checked the task manager and there is like 50 tasks running- is that normal? The task manager cpu graph also spikes to 100 about twice a minute with zero programs running. When i run the internet the task manager cpu graph is steady 50-100. My internet is crazy slow, takes about 30-60 seconds per page to load. I make music on one program and when i render out or when im transfering a file through wetransfer.com or something "heavy" I cant do anything else, my mouse gets all choppy and slow and clicking on like another tab or something isnt happening. It basically doesnt do anything until the big things are done.

I dont understand, I used to run my media player, browse the internet with like 10 tabs open, and run like a paint program or something all at the same time. I have an external hard drive for all my music stuff so there really isnt anything on my computer, like 1 decent sized game and some personal files. I dont really do much on here.Is it possible i deleted a program or something that is a part of the computers natural operating system, and it is tripping over itself or what? Doing a system restore would basically be impossible because I have been baring with this for a while and I dont know when this started and what programs/files I would lose if I restore back a few months.