How do I stop Ask from trying to reset my home page every time I open a new window?

Every time I open a new window I get a pop up that says:
“Firefox Homepage Change Notification. Your home page has been changed by another application.”
Then it gives me the option of “Reverting to my previous page,” or “Continue with the new home page.”
If I don’t check “Revert” it brings up Ask as my search engine. Bleh.

At the bottom left, in small font it says, “Distributed by Mindspark Interactive Network, inc.”
At the bottom right it says, “Fun Popular Game Toolbar.”

I know where it came from. I pulled up Spider Solitaire yesterday for a bit, but how do I get rid of it?
There are no games in the program list to uninstall.
There are no games anywhere when I search Windows.
I unchecked all but Firefox in my internet options window.