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If I try to enter '0.5' into the "Wait:" field in screen saver settings, I get this error when I press the '.':

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I want to activate the screensaver in half a minute.

The only solution I came up with was to write a program to monitor user input, and activate the screen saver after 30 seconds of no activity. If worse comes to worse, I can do that, however I prefer to simply change it in the windows system settings.

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You can modify this setting in the registry. In HKCU\Control Panel\Desktop modify the ScreenSaveTimeOut value in seconds, then restart the computer or re-login. However, I have not tested whether a value under 60 will actually be kept after restart/login, so let me know if it doesn't work.

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It worked, thanks for your help. –  Chipperyman Aug 27 '13 at 23:42

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