Running from cd

I am trying (unsuccessfully I may add) to run directly from cd.

My problem is this, I have a computer with a non operational copy of windows. Pretty sure the boot sector of the hard drive is bad. I could just reformat and start over with opensuse but there is data I need to recover first.

when I try to run the os direct from the cd instead of installing it to the hard drive it askes for a username and password that I don’t have.

Obviously I am new to this, any help would be most appreciated.

1: Which live CD are you using?
and
2: have you tried to repair the windows bootloader?