Does anyone know how to reset the Keychain login access when booting from disc?

I recently had Lion go bad on my Mac Pro (screen hung up with twirly grey circle). I tried unsuccessfully to repair permissions etc, so I decided to install Snow Leopard onto my other internal drive as this was the latest system I had on a disc; bootup with that and update to Lion.
After installation the machine restarted and asked me for the login user and password. I thought this was odd as usually it would ask to set this up when you first bootup; I can't get past the login. My question is how do I reset the keychain login access when booted  m a disc or is there a default I can use?
Regards

I re-installed in  the end and the usual load in screen came – all sorted...

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