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After adding a local user admin to permissions for HKEY_CLASSES_ROOT in registry editor, and computer restart, system cannot boot When the system loads,after the Windows logo and load screen (before login screen) there is a black screen with only the mouse showing and I cannot even boot into Safe Mode. I tried to repair windows or edit registry with HIREN'S Boot CD but No results were not.

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closed as off topic by MDMarra, joeqwerty, Dave M, Chris S Oct 20 '12 at 18:28

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You didn't actually ask a question. – MDMarra Oct 20 '12 at 13:15
@MDMarra My windows does not load up and I just see black screen, I need help to find and fix issue – Ehsan Davoudi Oct 20 '12 at 16:36

Restore from your last good backup.

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+1 The registry is hosed... time to learn from your mistakes and restore from backup. – Chris S Oct 20 '12 at 18:28

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