I havea problem with my computer, any help will be appreciated.?

Sorry to say that your OS installation may be corrupt or you may even have a failing Hard disk or secrtor on your C: drive. If you can no longer boot into windows, the only option is to insert a recovery disk (if available) to recover the OS or to insert a windows installation disk in the disk drive and try to repair or reinstall the OS. I suppose you use windows XP (from your error message above), insert your XP installation disk in the drive and boot your computer from it and try a repair/reinstall.