I found a large number of entries in my registry like these for every version of CCleaner that I have installed over the years. Each uninstaller should be removing these, but they aren't. Since these are left over, perhaps CC could remove them for all older versions.
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Tracing\ccsetup318_RASAPI32
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Tracing\ccsetup318_RASMANCS
I also found a large number (maybe 30) of similar entries for old Flash Player versions:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Tracing\FlashPlayerPlugin_11_3_300_257_RASAPI32
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Tracing\FlashPlayerPlugin_11_3_300_257_RASMANCS
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Tracing\FlashUtil10h_Plugin_RASAPI32
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Tracing\FlashUtil10h_Plugin_RASMANCS
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Tracing\FlashUtil32_11_2_202_228_Plugin_RASAPI32
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Tracing\FlashUtil32_11_2_202_228_Plugin_RASMANCS
The AAWService for the Ad-Aware program which has already been removed still exists.
There are also a lot of dead entries for Adobe Reader version 6, 8, and 9 scattered throughout the registry, even though those were removed long ago.
Also, many entries for old Java versions that no longer are installed:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Tracing\JavaSetup7u13_RASAPI32
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Tracing\jre-6u17-windows-i586-s_RASAPI32