My computer is a Dimension 2350.   When I try to boot I get the message "A problem has been detected and Windows has been shut down to prevent damage to your computer.  Registry Error Stop: 0x00000051 (0x00000004, 0x00000001, 0xe14c40e0, 0x00007cb8)"

When I try to boot from my Dell XP CD it proceeds normally until it asks me if I want to reinstall Windows or Repair Windows.  Either option leads me back to the Registry Error message.  I cannot get the Recovery Console prompt.  I have data that I need to retrieve off the HD before I attempt a clean reinstall however it is not clear to me how I would even do a clean install if I cannot get to the Recovery Console prompt.  I have exhausted my computer knowledge and am desparate for assistance.  Any help would be appreciated.  I did run the F10 hardware diagnostics and they came back clean except for "Error Code 4E00:011XC, USB Controller 0, MSG: Register #0 read write failed (8bit), found 40h expected 00h) not sure if this is contributing to the problem.