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Windows Utilities and Tweakers
For example. svchost.exe will always show up in task manager as is a system process belonging to Windows which handles processes executed from DLLs. This process has to run or Windows won't. You wouldn't want to terminate this process.
However svchost.exe is also assocated with the W32.Welchia.Worm. It takes advantage of a Windows vulnerability (which a patch has been issued for).
But how do you determine if it's a necessary component or part of a worm? WinTasks will tell you along with the above info about the svchost.exe process. Cool.
Be fully in charge of Windows and nail down that last bit of control. Win Tasks is incredibly simple to use for an incredibly complicated area and you might be surprised to find what's running on your computer, all without your knowledge.