[CCleaner not downloading properly]

Started download of CCleaner 5.03.  It stopped very early in the process.  It will not complete, nor can the download file be removed because it is still in use.  It has hung.  How can I close or remove it?  

[Registry Cleaner removed setting which I need; how do I restore previous setting]

Possibly a recent change in Internet Explorer has removed the task bar from view whenever I access a web page through IE.  I find this very annoying.  With help from HP technical support, settings were changed to allow the task bar to always be visible.  After that change, I ran Registry Cleaner, as I do from time to time.  After running Registry Cleaner, those changes which allow the task bar to show were gone.  Again I have no access to the icons on the task bar whenever using Internet Explorer.  How can I restore those settings which the Registry Cleaner removed?  I did make a backup within Registry Cleaner before I ran it.  How can I access and return to the conditions before running Registry Cleaning?   Many thanks for help with this.  

Joan in Idaho  

[CCleaner wipes out AVG history]

Each time I run CCleaner, the history of Anti-Virus Grisoft (AVG) is removed. AVG then thinks it hasn't run before and does an initial scan which takes hours. How can I set CCleaner so it does not remove the AVG History?