CCC has always functioned well and without any bugs or troubles for me and I first used it in 2005 or 2006.
If so, then ATi had major FAIL for not doing pretty much anything to help me figure out WHY CCC was buggering my system. I remember when I had a problem with a driver update causing a game (Splinter Cell: Chaos Theory) to seize up in the last mission.
ATi blamed the Ubisoft.
Ubisoft blamed ATi.
What really put me off is that in spite of the fact the program worked fine before the driver upgrade, ATi sat there like a spoiled 4-year-old insisting it was not their driver that was to blame for the problem.
Neither had solutions, but the fact was clear, the game ran PERFECTLY with the stock ATi drivers that came with my card. Upgrade to the latest drivers (as Ubisoft recommended as a "fix") and everything went south.
Hence why I advocate "if it ain't broke, don't fix it."
The latest drivers ARE NOT necessary if everything you have runs fine.