Just turn off sharing, and you should be alright. When running anything I'd recommend running a custom firewall called PeerGuardian 2. it blocks the ips of all known mpaa, riaa affiliates and its lists are updated regularly.
Not foolproof, as they spike downloads. If you grab one, you get a legal notice and have to pay.
And BTW, they're not stupid. They pay consultants to do that from private IPs outside RIAA and other official IP ranges.
I just have no sympathy for you if you get one of their letters and have to cough up four or five digits, because it happens every day, and you're not going to be able to fight it. They keep VERY comprehensive records of the entire download and can pull your records from your ISP if you object.