I'm looking for an anime I watched awhile back.

it's an anime that involves a video game that gets a virus. and one character has to use her video game character to defeat the boss in order to get the game back to the way it was. I'm pretty sure her character was a huge rabbit who kick boxes. can someone help. I've been trying to find the title of it for quite some time.

Sorry, this might not be the same as you're saying, but try Summer Wars. It's not an anime, but an anime movie. Its description is very suspiciously close to your description so you might want to try it. Because instead of a video game, its more like an alternate video game-like reality and instead of her character being a huge rabbit, it's a different character whose avatar is a big rabbit. Hope this helps. :)