Every day between 4 and 40 my computer is on standby while I exercise. During that time, it wakes itself up, hums and churns for a few minutes, then puts itself back on standby. MS Essentials is programmed to scan on Wednesday at 10 a.m. I've turned on the monitor when I hear the computer wake up to see if I can see what it's doing, but nothing is showing. Any idea what it could be? It's a new Acer Aspire Core 2 Quad, Win 7 Home, with only MS Essentials as my antivirus/antispyware. Just curious what's going on behind the scene. Thanks.