Cannot be done, however, there are third party clocks out there that are
free and will do what you want. One is the Round Clock which is part of the
old Windows 95 Powertoys. This will still work with XP.
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The reader should exercise normal caution and backup the Registry and
data files regularly, and especially before making any changes to their
PC, as well as performing regular virus and spyware scans. I am not
liable for problems or mishaps that occur from the reader using advice
posted here. No warranty, express or implied, is given with the posting
of this message.