Not another 100% disk post!

So I have spent two hours booting up my laptop, failing multiple times, and now I’m able to access the task manager. I’m apparently stuck at 100% disk utilization and this was not a problem last night. I check the performance tab and notice that my one terabyte SSD drive is at 931/932 GB formatted/capacity. I don’t have a clue how this happened, but I cannot have this happen again. Any ideas as to what jeopardized my laptop? Windows 10, 1 TB SSD, and about one year old Samsung.

Update: I can now open programs, but I am still at 100% disk usage. Wtf is going on here?

Update 2: it was my antivirus software downloading a crapton of updates. Problem solved itself.