Sounds like you need a baby or two to punch, joker...

Try this:
1. Uninstall CCC and everything ATI-ish. Do not restart.
2. Driver Sweeper (use 2.9.0). Restart.
3. Control panel - Device manager - Display Adapters. Right click and uninstall. If it asks you if you want to delete driver software, say yes.
4. Restart.
5. It will detect the cards - let it, then restart when it prompts you.
6. Download CCC 10.10 (this one has always played nicely with me).
7. Install 10.10. Restart.
8. It should prompt you if you want to use Crossfire - leave that box checked.
9. BOINC should see two cards. Hopefully...