gnome에서 스크린세이버 안돼요...

스크린세이버를 등록하려고 하면 아래와같은 메시지가 나옵니다.

The XscreenSaver daemon doesn't seem to be running on display ":0.0".

Launchit now?    Yes / No

여기서 예스를 누르면 다시 아래와 같은 메시지가 나오네요.

Error :

The xscreensaver daemon did not start up properly.
You are running as root. this usually eans that xscreensaver was unable to contact your X server because
access control is turned on. Try running this command :
xhost + localhost

and then selecting 'File / Restart Daemon'.
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.
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You shouldn't run X as root. Instead, you should log in as a normal user, and 'su' as necessary.

어떻게 조치하라는 건지요. 고수님들 갈켜주세요...