Change the 'Put the computer to sleep' value to 'Never'.On the left hand menu, select 'Change when the computer sleeps'.Expand the USB settings and then expand USB Selective suspend setting. Click the Change advanced power settings link. When the Power Options window opens, click the Change plan settings link to the right of your current power plan. You can also just edit your current power plan: Press the Windows key + R to open the Run box. My Asus laptop had its own power management system that played havoc. To prevent sleep while CSAM is scanning, just select the 'High performance' plan. A lot of times Dell and other companies ship software bundled with the windows install. The third one can be made visible by clicking 'Show additional plans'. On a laptop, your computer goes to sleep when you close the lid.

Two are always visible, but the third one is often hidden. Visiting Controlpanel->Hardware and Sound->Power Options->Change Plan Settings->Change Advanced settings, you see a tap Sleep. A screensaver password and a sleep/stand-by password are different settings on.

On the Power Options control panel you can also create a second power plan configured this way.

Power Options control panel: Start button > Control Panel > Hardware and Sound > Power Options While performing an on-demand scan on your computer, it may be necessary to adjust the power options to prevent the computer from automatically going to sleep mode after being idle for some time.

Windows 7 goes to sleep