Loading Scans never stops loading

I’m having an issue with my Avast on one of my computers, where when I go to “Protection” and select “Scans”, it says “Loading Scans” but never actually gets to the selection screen where I can pick a scan to use.

Any suggestions on what might be wrong or what to do to fix this? Your help is much appreciated. Thanks!

Repair Avast:

  1. Control Panel → Add/Remove programs → Avast
  2. Click on ‘Repair’.
  3. Follow instructions.
  4. Reboot.