I know that ccleaner is considered to be the holy grail of registry cleaners, but in my opinion, it falls short of doing the job properly in many respects.
For example, I updated an app called Quick Media Converter yesterday which went pear-shaped and after trying various options to correct the problem, I finally decided to uninstall the app and remove the registry entries before proceeding with the reinstallation. When I ran ccleaner after uninstalling it via Add/Remove Programs in Windows XP Pro and rebooting, it displayed a number of HKLM entries which I allowed your app to remove.
I then ran a scan of the registry using the "Find" option and was surprised to find a plethora of entries which ccleaner appeared to have missed. I then checked the Application Data in the "Documents and Settings" folder and found a number of entries for QMC which I dispatched to the Windows Recycle Bin. I then ran ccleaner again, but it didn't find anything. Checking the registry once more, I was surprised to find all the keys and subkeys complete with their data still present. Thinking that the Recycle Bin may be the culprit, I rebooted and then emptied that too. No change with ccleaner, but doing a manual search of the registry as before, all the data was still present.
I've attached a few screenshots to illustrate what was found by ccleaner during the first scan. After deleting the relevant "Application Data" mentioned above, the second ccleaner scan found only two problems both of which have nothing to do with QMC. You can see the results in one of the other images. The third image shows a number of entries pertaining to the PC SOFT key which is part of the QMC installation.
My question now is, why does ccleaner ignore these registry entries? Your app ignored all the HKCU data listed on this site: http://www.checkfile...Index/0/sTab/2/ for example.