No, you can't. You can only use Microsoft Points for your Avatar, DLC's, Games, Music, and Movies. Sadly, you can only get Gold membership by using a credit card or buying a 3 month ($25) or 12 month ($60) membership at Gamestop. Or you can get Live through Xbox.com, but to answer your question, no you can't use Microsoft Points to get Live, sorry, I know It's dumb, I hate it too.