Found !
PD logs are saved in
C:\Documents and Settings\All Users\Dati applicazioni\Raxco\PerfectDisk\8.0
There are 2 files in here, "PDBootLog.log" and "PDBootLog" (without extension).
In my (very humble) opinion, this issue is due to different Windows localization
For me, in Italy, "Program Files" is "Programmi" and "Application Data"
is "Dati Applicazioni", so CCleaner maybe can't find that folder because,
according his winapp.ini file, by default it search for it in:
"FileKey1=%allusersprofile%\Application Data\Raxco\PerfectDisk\8.0|PerfectDisk.log
--------------------
trying to delete a file named "PerfectDisk.log" that doesn't exist,
the correct names of the log files are "PDBootLog.log" and "PDBootLog"
I have tweaked my winapp.ini as follow:
[PerfectDisk 8.0]
LangSecRef=3024
Detect=HKCU\Software\Raxco\PerfectDisk\8.0
Default=True
FileKey1=%allusersprofile%\Dati Applicazioni\Raxco\PerfectDisk\8.0|PDBootLog.log
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an now it seems to work fine
Hope this helps