Programs that are not installed, appear in "Application" tab in "Cleaner" menu.

I thought only programs that are installed on the PC are available in the "Applications" tab in "Cleaner" menu. I don't understand why NERO, SuperAntiSpyware, Winamp etc are listed in the applications tab, though I don't have any of them installed. Probably I might have had them a long time before, but shouldn't these entries get cleaned up in this tab. How do I remove them? Because listing them here in the applications tab, seems to be useless. Are there any traces of these applications left on the disk?

These are still listed because their uninstalls leave behind items. The Best way to remove no longer installed software from ccleaner is this procedure

from your startmenu searchbox or CMD/run prompt type the following

"C:\Program Files\CCleaner\Ccleaner.exe" /export

The Quotes are important replace c:\program files\ccleaner with the location of your ccleaner if different and ccleaner.exe with the name of the 64bit version if that is what you use.

The in the Resulting Winapp.ini file (found in your ccleaner program file) search for the programs

You will see an entry such as

[Winamp]
ID=2166
LangSecRef=3023
Detect=HKCU\Software\Winamp
Default=True
FileKey1=%ProgramFiles%\Winamp|winamp.m3u
FileKey2=%ProgramFiles%\Winamp|winamp.m3u8
FileKey3=%ProgramFiles%\Winamp\Plugins\ml|recent.dat
FileKey4=%ProgramFiles%\Winamp\Plugins\ml\cache|*.*|RECURSE
FileKey5=%appdata%\Winamp|winamp.m3u
FileKey6=%appdata%\Winamp|winamp.m3u8
FileKey7=%appdata%\Winamp\Plugins\ml|recent.dat
FileKey8=%appdata%\Winamp\Plugins\ml\Cache|*.*|RECURSE

Remove the registry entry and/or file/folder listed in Detect or DetectFile

refresh ccleaner (if currently running) by pressing F5 while in the applications tab (or instead the list will be correct the next time you run ccleaner)

I just did as you suggestions but to no avail. I deleted all the entries related to Winamp and Nero, searched the notepad for "Nero" and "Winamp", there was no items, ran CCleaner and it's still present.

I manualy went to HKey Users:\* in registry and deleted the entries and it's gone now.

no don't delete from the ini, delete from registry and explorer, the ini is just to tell you what to delete.

I cannot get rid of Opera in Applications. I uninstalled this browser months ago. I crawled through the registry and deleted every single reference to it. I upgraded to the latest version of CC, also. I rebooted and Opera is still in Applications.

Any more suggestions?

Install Opera and then you can use RevoUninstaller to remove it again - together with registry keys that you may have overlooked.