Loading Scans never stops loading

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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!

[Asyn]

Repair Avast:
1. Control Panel -> Add/Remove programs -> Avast
2. Click on 'Repair'.
3. Follow instructions.
4. Reboot.