Recently I logged onto a Windows XP machine for an IT support customer in Skipton.
 I received an alert that C:\ was running low on disk space. This was odd because all that is installed on this PC is Office 2003 (the hard disk is 30GB in size).
 I checked all the usual folders size, all looked normal. No unknown or hidden files or folders. Last thing I checked was the size of the Windows folder. It was sitting at 29GB!! on further inspection I saw a hidden folder “CSC”. Turns out that this is the location for stored files (if offline files is enabled). To check this, open up windows explorer, click the tools menu, click folder options.
 The last tab is “offline files”. If this is enabled, your “CSC” folder will grow!
 I disabled offline files and then deleted the CSC folder. Problem solved!
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