I am not sure but cleaning up temp files are those files that are in the Windows temp folder, it should have nothing to do with PHPs temp files which are in the
c:\Program Files\xamppp\tmp folder unless you created another one and then redifined where you put it in the php.ini file. It just hold stuff like session cookies and what not and might only have two or three files. Usuall it will destroy files when they are no longer needed.
The temp folder in the
c:\WINDOWS\Temp however has all kinds of stuff and is used when you install programs and doesn't necessarily clean them up just look in there and you will see what I mean.
You might need to uninstall and reinstall your xampp install cause it sounds like there is some file corruntion or configuration maladies. When reinstalling just accept the defaults as the install goes about its thing.
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