Need Help With Error - Unmountable Boot Volume

it's a damaged file system case to resolve this follow the steps :-


1.Insert the Windows XP CD-ROM into the CD-ROM drive, and then restart the computer.

Click to select any options that are required to start the computer from the CD-ROM drive if you are prompted.

2.When the "Welcome to Setup" screen appears, press R to start the Recovery Console.

3.If you have a dual-boot or multiple-boot computer, select the installation that you must access from the Recovery Console.

4. When you are prompted, type the Administrator password. If the administrator password is blank, just press ENTER.

5. At the command prompt, type chkdsk /r , and then press ENTER.

6. At the command prompt, type exit , and then press ENTER to restart your computer.

HELP!!! i go this message "Unmountable_Boot_Volume"
tried to follow insturctions but nothing will work, i tried putting in to cd rom the microsoft operating system cd. but it does not move from the blue error screen, i tried putting in the cd into my other diff. computer, and it works. so its not the cd. what else can I do?