Problem reinstalling SL from Lion

[manowar]

i can't seem to be able to reinstall snow leopard onto my MacBook Pro, it keeps coming up with error.
can anyone help please

 

[manowar]

i haven't even got the option to delete the hard drive

 

[dcorban]

Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_4 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8K2 Safari/6533.18.5)

Boot from the disc.

 

[Nuckinfuts]

Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_4 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8K2 Safari/6533.18.5)

Boot from the disc.

This, and back up your data before hand, you WILL NOT be able to simply install over Lion, you'll need to erase the disc