I will tell you what seems to have worked for me. I'm running win 7 home - AVG 2012. set updates to manual in curse client. go to the task bar (bottom right of window small icon) and right click avg 2012 icon. Choose temporarily disable avg,. you can choose from 10 min and up. After its disabled run your updates.for curse. after updates are finished restart avg.(double click on avg icon onscreen or from task bar}
Note: you may need to uninstall curse client and reinstall while avg is disabled. I would also sugjest deleting old setup file and downdload a new one after running defrag. This may not be nessisary for everyone but its a good tip for getting things to install correctly.
Let me know if anyone else can repeat my results my curse client stars up every time now.
PS. I just joined the forum tonight, for this post. I use curse for World of Warcraft.