Are you sure the wording isn't chkdsk (CheckDisk) - this runs after a Reboot after opting for Error Checking.
If not, see:
I would run virus and malware checks just to be sure nothing is amiss.
Then go to My Computer>right click>>highlight your hard drive (usually C)>Properties>Tools tab>>click on Check Now button in Error Checking>>tick both boxes from panel which appears and click Start.
Now Reboot to allow CheckDisk (ChkDsk) to run.