yup , going to a shop is the sure thing here dude , i did that same thing today and cleaned my disk
Well, I had that problem and I took it to a local games trader and they had a machine that got rid of the dreaded disc burn. Saved me a good 60 bucks, twice. It also makes your disc really really really shiny.
If you head down to a store like game or gamestation, if i remember correctly, they have something that should fix it, if not they might now of a way to resolve the problem. Hope that helped.
thx guys appreciate it :)