Have you ever wondered what that "svchost.exe" service was running multiple copies on your Windows PC? In case you do wonder, check this out from Langa's blog. Fred Langa is the guy behind the famous Langa Letters who writes for InfromationWeek. He explains what svchost.exe does and an unusual way to find out which services and processes are running behind all those svchost.exe entries in your task manager. He says that using Windows Defender will give you more detail on what is going on behind the scenes. I a big fan of Langa for this reason, and instead of rewriting my own version of what I would do, instead I'll point you to this excellent resource he has written on the subject.