Hello Becky6319
Can you please elaborate the issue? Such as, when did the scanning start, did you start the scanning and repairing manually or it was auto-started by the operating system, did the operating system have any error, or did the OS behave obnoxiously, etc.?
In any case, 24 hours is way too long time for the process, especially when it is stuck at the same state.
You should power off and restart the computer and initiate the scanning process manually to rectify the issue. You can
Use the SFC /SCANNOW Command to Scan and Repair Your Operating System.
Hope this helps.