Installing Snow Leopard with broken disk drive.

Hey all,
My Macbook Pro's (mid '09) disk drive has unfortunately broken. I've observed this due to it not recognising any CD or DVD that has been inserted since around september 2010.

I finally decided to convert from Leopard, to Snow Leopard and bought a retail CD from my local Apple Store. Rather stupidly, I forgot about the broken disk drive and have just realised that I can't install from the install DVD.

Could anyone please help me by suggesting where I could either get:
A) A digital download, which is activated by the code provided by Apple.
B) A driver that will help my CD Drive problem. (The CD drive spins up, but it fails to recognise any CD or DVD inserted. It sounds like it's struggling desparately to please, but it just can't work it out )

Thanks,
Hector