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24 Feb 2010  
richc46

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium SP1, clean install, upgrade disc
 
 

Karl,

It is my hunch that the big difference is due to shadow copies, which you clean with your version of disc clean.

If the OS version of disc clean is used and you include the system files, do regular maintenance you will get results like yours.
My System SpecsSystem Spec