My operating system (Snow Leopard) was running quite good but I used some tools from internet to free some HDD space. Then some days later I figured out that Safary is not able to start anymore.
Now I'd like to repair the current installation or re-install the OS X.
But how can I do that?
I managed it to create a bootable USB drive from the installation image. When I boot from the USB drive, the installation asks me which drive is to be used. And when I select my laptop drive the installation program shows the message that this drive cannot be selected.
What should I do in order to force the installation to overwrite the current instance of OS X?