Sleep mode should be already installed, I do not recmend it with desktops however you have a laptop so here is what I need to know can you even see an option for sleep mode or does your laptop go into sleep mode then wake up? Also what operating system are you running? It looks like vista is that correct Vista has known problems with sleep mode. If you have the option for sleep mode and it wakes up right away go into device manager and disable your mouse and net work card to allow the pc to wake up for these devices
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