My internal DVD writer stopped reading discs after a disc jam. I continued using my PC with an external DVD rewriter drive. Then catastrophe my registry became corrupted when I run recovery I get C0000218 registry file failure. Registry cannot load the hive file \systemroot\system\32\config\security or its log or alternate it is corrupt, absent or not writable. Is there any method of accessing windows to recover my PC. Note I have tried safe mode last known good config etc the PC continues to shut down and come up with the windows black screen options menu selecting any options repeats the process. Any help would be welcome. Thanks Ed.