Unable to boot system. getting error message.

Hello,

I am unable to boot my system. -

I first get the black screen that says that it wasn't shut down or some other issues
> properly and gives me the choice of booting to Safe Mode, Last Known Good,
> Normally, etc.
> -No matter what I choose it almost immediately says, "Windows could not
> start because the following file is missing or corrupt:
> \windows\system32\drivers\isapnp.sys"

If i am trying to repair the windows using Windows XP cd, cd content is not displayed. Again the same black screen with messages like boot system in safe mode etc is displayed.

Could you please help me in resolving my issue.

Thanks and regards