I SET WINDOWS to enter standby after 30 minutes or an hour, which strikes a balance for me between too often and not often enough. I also recommend that you open the Power Options Control Panel applet to configure the power but¬ton on your system to invoke standby or sleep mode rather than to turn the PC off. In XP, choose the Advanced tab, and under 'When I press the power but¬ton on my computer', select Stand by.

In Vista, click Change when the computer sleeps or Change plan settings. In the Edit Plan Settings dialog box, choose the idle time before turning your moni¬tor off and putting the computer to sleep. Next, select Change advanced power settings, click the plus sign next to 'Power button and lid', choose the plus sign next to 'Power button action', click the current option to make the drop-down menu appear, and select Sleep on that menu.

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You can also invoke Windows' sleep mode manually: In Windows XP, click Starte Turn Off Computere Stand By. In Vista, click the Start button, choose the right arrow in the bottom-right corner of the Start menu, and select Sleep. (Note that Vista may have standby selected by default.) To resume, press the power button or any key on the key¬board, or simply move your mouse.