ShadowTiger wrote:I use this program called WinDirStat which maps out your hard drive and shows you which folders are taking up the most space. You can look for a similar visual directory browser or use that one to quickly track down the issue.
There are other versions for other OSes too.
JohnC wrote:1) New restore points were created?
2) Someone downloaded something without notifying you?
3) Windows crashed and made a full memory dump?
4) SSD's controller is trying to use more free space because of some memory "wearing out"?
Like people already said, use the Disk Cleanup utility, see if it can reclaim all of this space...