[CentOS] The screenSaver is blocked in my centos5.3

Mon Aug 23 16:36:55 UTC 2010
ganu MailList <ganu4maillist at gmail.com>

When I open the screensaver windows in the kde,  I find that it is blocked .
I switch to the gnome,   it is the same.   Is it some rpm that I do not
install it?
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