Is Popcap spyware? It turned out to be on microsoft antispyware. Why?

It did not have a popup. I just installed Insaniquarium on my PC and microsoft antispyware said it was spyware.
It did not have a popup. I just installed Insaniquarium on my PC and microsoft antispyware said it was spyware. And no. It was not called Popcorn (whatever that is)
what is greyware?

Popcap seems to be more of greyqware than spyware