Why so much DISK USAGE! HELP
svchost is a legitimate Windows service (though it can be infected with malware), but it's long been problematic, at least on Windows 7. I heard that it was supposedly fixed (for the most part, at least) on 8/8.1/10, but maybe that wasn't entirely the case. Anyways: it's a host program for a lot of miscellaneous Windows processes, including Windows Update (which is run by the netsvcs process that's hosted in svchost), and it's a fairly widely-known problem that it can sometimes eat up huge amounts of system resources. I've had times where it used up 80% of my CPU and a quarter or more of my RAM at one time--it really can be an awful blight on your system, which is inexcusable behavior for a core part of the OS. I was never able to diagnose specifically what was going on beyond "it's netsvcs" (which seems to be the usual culprit for a lot of people), much less how to fix it, but you might have better luck. See if you can find out what specific process within svchost is consuming so much of your disk usage. You can use the Resource Monitor to see what the specific process is--the Resource Monitor is a separate program from the task manager, tough in 7 and 8 you can access it through the "Performance" tab of the task manger, and it provides much more detailed information about resource usage. Memory, CPU, networking, disk usage, and I think a few others, all broken down by process. If you can find what process within svchost is the problem, that should make it a lot easier to ding the fix.
I'm not 100% sure about this, but I don't think this problem would necessarily be fixed by upgrading to an SSD. If it's a Windows process constantly reading and writing to your disk, it might just eat up the increased read/write speeds of an SSD and continue tanking your performance. It also might finish whatever it's doing a lot faster, thereby slowing down your system for less time. I can't say for certain which of those might happen if you switch over to an SSD, but the problem might well be solvable without shelling out the extra cash.

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