I'm having crazy slow downs.

I have been working on my computer for the last three days trying to figure out what was slowing it down. I did everything, and I mean every diagnostic thing I could think of. I scanned everything, system files, bios, drivers, malware and corruption issues, and then processes. I was unable to find any significant reason that my PC was acting slow. I then ended all processes that were not essential for my PC to run, still no change. I ran in safety mode, and it ran flawlessly. I eventually caved in to a full system reset, which I really didn't want to do. I reinstalled everything one by one, finishing with Webroot. It slowed down my PC immediately. I was surprised to say the least, because my computer had been fine with it before. What changed?

Ok, so this is what the slow down acts like. Normally my computer can run a lot of stuff at once, opening a bunch of things at the same time too with ease. Then after some updates for Windows 10 (at least I think so) this happened. I saw sudden slow downs, in really strange ways. The programs themselves run fine, but then web browsers would eat up all power. I first noticed it happening when I couldn't scroll down on a big page, so I opened task manager. Then boom, a huge slow down, task manager would pop up as a blank screen, slowed my computer down, and lagged out my mouse. After 10 seconds it got back to speed, but because the task manager was blank during the slow down it was not too obvious at first to what was going on. After looking online it seemed to be a CPU problem, but the process percentages in all categories were going crazy while I was running web browsers (I also checked my CPU temps, they were fine). When I opened bigger programs, it would happen too. For instance, I was watching a tutorial on Youtube through my FireFox browser, with just two tabs open (I was scared it would fry my CPU to do more, this was before the temp test). Without thinking, I opened my video editor to try out what I learned, and it happened again. It acted just like the task manager did, only it sat there for about a minute, with a super lagged out mouse.

Based upon how it's acting, what do you think the problem is? Personally speaking I know it could be some sort of problem between both Windows 10 and Webroot, but the way I see it, Windows 10 is running fine on its own and I think a fix for Webroot sounds easier, and better in the long run. I know there's the idea of just turning back windows 10 to an older version, but I'm kind of done with messing with that idea (Also, I can't anymore, I have no older memory of old updates). Three days of messing with Windows 10 and other programs to find out that Webroot is the perpetrator is pretty frustrating, especially if being up to date on all programs and systems is supposed to be the safest.

Anyways just in case you need them, here are my specs. My pc was made by CyberPowerPC (I already worked with them). It has an Intel core i7-7700K, 16 gigs of RAM, the system is a 64-bit, it also has a Nvidia GTX 1060 6GB, and has a dedicated sound card Asus Xonar DX. Oh, and I'm running on Windows 10 Home version. I've owned this computer for about a year, so age shouldn't be a problem.
 
So, I did not install Webroot on this new system yet. First question is, is it safe to install? I don't want to have to do a system reset again. Second, if it is not the setup of Webroot that is the cause, what is Webroot doing that is causing my slow downs? How would I stop it?

Thanks in advance for any help, I'll be waiting for an answer.
Tycho