One great thing about language learning is that your subconscious works on it while you’re asleep, so if you listen to enough French (if you can, watch French TV and listen to French radio), even if you don’t understand most of what is being said, it will help. Just be sure to supplement your Rosetta Stone learning with that sort of thing, as it is easy enough to understand simple sentences and words, but when you’re actually listening to a steady stream of French, it becomes far more challenging to pick them out. Half the challenge is just being able to recognize a word or phrase you know amidst a bunch of words you don’t understand as well.

To reiterate: don’t wait a few months before listening to people actually speaking French in some sort of media. Even if you don’t understand a word they’re saying, or it’s just in the background, it will help you in the long run. Immersion is the best way to learn a language, so the closer you can get to that, the better.