This is not on my system but my coworkers. I've never gotten this before. Her pc was just recently purchased "clean" i.e. no junkware and also Windows 10. I'm still on WIN7.
I've seen that in the past when RAM is running out (sometimes I'd have lots of apps running). But that was in the days of less than 4 GB of RAM.
Another idea: Defrag the C:\Drive.