If you copy the entire partition and resize it, avast should work.
Sometimes, you need to enter your registration key again.
But you can try an installation from the scratch:
1. Uninstall avast from Control Panel first.
2. Boot.
3. Download the latest version of
Avast Uninstall and use it for complete uninstallation.
4. Boot.
5. Install again the latest
avast! version.
6. Boot.
7. Check and post the results.