No problems here with CCleaner 2.35.1223, Cat. It's working very well on my x64 desktop, but I always download the slim version, which is sans toolbar. If you still have issues with this version, you may want to uninstall completely and try the slim version, which can be found here ..
http://www.piriform.com/ccleaner/builds.
Don't know if it really matters in the long run, but I never *update* a program. I always completely uninstall it and download the new version, just to make certain that the new version doesn't conflict with something that may have inadvertently been left behind from the previous version.