Fix loud scratchy audio for a YouTube video?

I recorded a Minecraft video for YouTube, but my laptop's mic picked up way to much sound and the video sounds all loud and scratchy. I have audacity and Sony Vegas Pro 12 and I was wondering how I should go about fixing the audio before I upload it. If it's not possible, I'm sorry for wasting your time. I just thought the video was really good and I don't want to lose it.

Guest

Step 1: get a decent mic
That is how you fix it.

Sorry, but it is very hard to recover bad audio, if at all.

Matt