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STOP: c000021a error

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I have a Dell Dimension 3000 with Windows XP Home. Can't boot to Windows, even in Safe Mode and I've tried the "last known good configuration" as well. Each time I get the blue screen with "STOP: c000021a {Fatal System Error} The Windows Logon Process system process terminated unexpectedly with a status of 0xc0000005 (0x00000000 0x00000000). The system has been shut down.

I tried the advice on the Microsoft website re running Dr. Watson, but can't get that to work (I tried to run from an ms-dos prompt at C:\WINDOWS since that's the only place I can type a command now & I get "unrecognized command" or something like that).

I've tried the Windows Repair advise on this site, but can't seem to work for me. (Dell did not send installation CD with PC; I have one for a Dell laptop purchased later but it's for XP Professional. I contacted Dell to send the XP Home install discs which they're doing, but will take a few days.) Any advise in the meantime?

If anyone can help, I greatly appreciate it!
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