[Pharaoh1100]

Every time I turn on my PC, something consumes 100 MBs of hard drive space.
I turned off the system recovery and deleted previous points, because it doesn't show them anyways, and that cleared, around, 10 GBs of space. But I fail to find out of what happens to be the mentioned issue. No, it is not a virus. System recovery creates a huge file, and consumes 100 MBs of hard drive space with each time of turning on a computer, automatically. You can find it in (OS:W7) Right click on Computer > Properties > System protection > System protection tab. By configuring the disc/k protection, you can erase the consumed space, or turn off system recovery.
But then again, something else keeps on consuming the available space.

[EliteTM]

Its unlikely, but have you check for any progreams in MSCONFIG > Startup/Service? Have you ran CCleaner?

[Pharaoh1100]

Its unlikely, but have you check for any progreams in MSCONFIG > Startup/Service? Have you ran CCleaner?

That is not helping

[Shoe]

Download "WinDirStat" - it'll tell you exactly what programs are taking up exactly how much space. If a pagefile.sys or pagfile.sys, I forget which it is, is the cause of the issue, Google search how to move it to a different drive. If it's a hibernation.sys or hiber.sys (jeez Shoe, figure out which it is) disable hibernation

[Pharaoh1100]

Download "WinDirStat" - it'll tell you exactly what programs are taking up exactly how much space. If a pagefile.sys or pagfile.sys, I forget which it is, is the cause of the issue, Google search how to move it to a different drive. If it's a hibernation.sys or hiber.sys (jeez Shoe, figure out which it is) disable hibernation

I'm currently trying this out, thank you; will edit this post or make a new post regarding an update
Edit: I found some passive-consuming corpses of programs, which I've previously been deleting and cleared a couple of gygabytes
Now I will produce an in-depth research regarding hibernation.sys

Final edit: I have found the issue. It was skype phone debug logs consuming hard drive space with each time skype opens and detects activity, creates a notepad file with the logs, which are each every single one of them being heavy in bytes.

[werhuman]

That would have been my suggestion. I had a similar issue on my laptop after it upgraded to Windows 10 (My Tower wasn't affected though). In my case it was error logs from Windows defender and Windows update??? There was an update a month later and the problem cleared itself. Prior to that I would have to keep removing them manually (tried writing a script to do it, but that didn't work as expected). Anyway at least you know now what it was. Something niggly like that can be so frustrating.