The two programs I most often leave running are Avast On-Access Scanner and eMule P2P client. It's a problem I've had for months after going through several updates for each program: I leave my PC for a few hours and come back to see that my screensaver, set for 5 minutes, never came on. If I modify the time, it somehow kicks it into gear and it start activating as it should, but after a while it will eventually stop working again. Avast and eMule are the only two programs I leave running on a regular basis, so it must be one of them. Does anyone else have this problem?