Basic and Full Scans Won't Run

I was trying to do a basic scan this afternoon and it won't run. I did one this morning and it ran fine.  I did Autofix and it says there are no issues. I tried to run the full scan and it did every task but skipped the full scan.  I have updated several times and it says I am up to date. I rebooted.  Still nothing.  What's going on?

I was trying to do a basic scan this afternoon and it won't run. I did one this morning and it ran fine.  I did Autofix and it says there are no issues. I tried to run the full scan and it did every task but skipped the full scan.  I have updated several times and it says I am up to date. I rebooted.  Still nothing.  What's going on?