Blowing on it isn't going to do anything for it...Unless it's actually dusty...YTF would it be dusty??!!
Install the game to your Hard Drive; that usually fixes the problem concerning disc unreadable errors...that is assuming that you can completely install it without getting a disc unreadable error.
Second option, go to BlockBuster, rent a copy for $7, and when you return it, return your crapped-out copy and keep the working one.
The Heart Does Not Desire What The Eye Does Not Admire.
"I'm not crazy 'cause I take the right pills every day."
Cogito, ergo sum - "I think, therefore, I am"
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DaRKSTaRxMeRC