okay so I have a samsung 840pro 128gb boot drive, which only windows, system drivers, and a few prime apps are located. Well, just a few hours ago, I come back to my pc, which had been running for 3 or 4 hours, and the screen was blinking saying, no space on c drive!!!. Now before that I had 61.2 free gb. So i did a system restore to 3 days ago (last windows critical update) and then rebooted and now i have 54.something gb. Another reboot 52.something. I do not know what is happening. I have done 3 troubleshooting techniques. sfc /scannow, defraggler, and chkdsk. But nothing is helped. Defraggler say's it's 43% fragmented if that means anything.