'Compress old files' on Disk Cleanup

From: Keith (keithtobin@ntlworld.com)
Date: 12/17/02 

From: "Keith" <keithtobin@ntlworld.com>
Date: Tue, 17 Dec 2002 12:58:03 -0800

When I run the 'disk cleanup' program it tells me that I
have nearly 53,000KB of files.
     1, How can I find out what these files are?
     2, Can I delete them safely without affecting
        the performance of my computer?

Many thanks for any assistance

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