How to restore or re-install after disc problems?

My Macbook Pro stopped starting up some days after installation of OS X Lion. It just opened yjhe gray screen with Apple logo and kept rotating the wheel and showing the progress bar.
After lots of efforts with secure startup etc, I booted from the installation disc, ran the inspect disc and tried to repair reported disc errors.The disc could not be repaired and I tried to restore from my Time Capsule.
I can see that Airport finds possible wifi spots (under system info / network), including my own, but I can not connect from any system tools.
Q1: how is that supposed to be done?
So I can not restore from Time Capsule.
I made a disc image to a newly reformated usb hard disc.
Now I am trying to install OS X (Snow Leopard) from my installation disc. After two trials, stopping after long time, saying (my re-translation from Swedish):
Installation failed
Mac OS X couyld not be installed on your computer
The installer could not copy necessary help files
Click 'Restart' ...
Q2: What is wrong? What can I do?

It's the key next to the "Apple" key on your left bottom row.  The key will say "alt" at the top & 'option' at the bottom.

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