I have the same problem. I have only run Quick Tune twice and both times at 23% analysis of the registry it sticks for 10-15 minutes before quickly finishing the rest of the analysis. This is definitely a product problem.
I have tried 3 times to reply with the dump file but this incredibly slow AVG Forum site just hangs. Can you give me an email address I can email the dump file to? This AVG Forum site is so bad it will put a lot of people off using AVG for anything.