Im also on w7 64 Bit. I installed 10.6 as well last week and wished i hadnt bothered.
I reverted to 10.3 and they seem fine.
If it was me i would download 10.3. When you run the drivers you get an option to uninstall. Use that instead of driver sweeper. When its finished run the drivers again and run the install. Hope that works for you. I have had CCC not show up a few times and usually a reinstall sorts it out.