I have gathered the locations of a few more files that should be deleted by CCleaner...
-Log Files
Here are some more Log Files that can be deleted...
WINDOWS\Sti_Trace.log
WINDOWS\wiadebug.log
WINDOWS\wiaservc.log
WINDOWS\WindowsUpdate.log
-OOBE
The OOBE Directory is the place that Windows stores all the crud that you see when you booted Windows for the first time.
This can be cleared out after the initial computer setup is done.
WINDOWS\system32\oobe\
-Windows Temp
This is just another temp directory.
WINDOWS\Temp\
I hope this information is of use.