How to unlock my internal HD?

This is the problem,
I bought a MacBook Pro in 2010 with Snowleopart installed with the OS CD in the box.
I installed Mountainlion two months ago.  Recently I had a problem with my HD.
I saved my files to an external HD and ran a test on my internal HD.
The test suggested that the problems could not be epaird and that I had to reformat the disk????
I did not reformat but erased the disk an ran the test again .... all was OK.
The I started again using CTRL and R and tried to install Mountanlion again. The program asks me to select the HD and Unlock it.However, I forgot the password.
THe I tried to reboot using the Snowleopart CD by holding the C key but it does not work?
Any suggestions?

I tried the PRAM reset ALT CTRL P & R when booting up.
I stll can not reboot from my CD using Snowleopart

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