The other day, while shutting down a pc after I installed some software, I was surprised to see the end task window.
Occasionally, everyone will get some windows tasks that are slow to shutdown (norton internet security comes to mind).
This time the name of the task was: Should Not See Me
Having never seen a task with such a strange name, I immediately started to think: infection
Well, after some digging around, it turns out to be nothing dangerous, but it is a very rare event, often triggered by a software installation.
Sure enough, another PC restart later, and there was no evidence of this task (and I did a full virus and antispyware, just to be sure)