The best way to do that is first to make an UBCD4WIN CD on another computer and start your PC from it. If the scan completes successfully, the registry can be restored by hand and the computer can be scanned for viruses. The easiest way to diagnose and possibly fix corrupted filesystem is to start the computer from a bootable CD, then scan the hard disk for errors. These error messages indicate a corrupted filesystem or a failing hard disk, about 40 / 60 chance. The laptop starts as usual but when Windows starts to load it goes to black screen with either “UNMOUNTABLE_BOOT_VOLUME”, “hal.dll is missing or corrupted” or “windows\system32\config\system” (or similar) is missing or corrupted. Computer files can get damaged in several different ways: by a power interruption, by virus or badly written software, by bad RAM or by physical damage to the hard disk.
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