How can I get rid of something that keeps popping up on my computer?

Sounds like you've picked up a virus. Update your antivirus software, then run a full scan. If it's any good, it can isolate or delete it.

where isit popping up? what does it say about it?

it may be a problem that needs taken care of.

or maybe something starting with Windows...

Go into network and sharing > manage wireless networks > click on BTWifi and click remove. If that doesn't work then highlight BTWifi connection > right click > properties > untick Connect automatically when network in range and make sure your Homehub network is ticked to connect automatically.