Black screen and pointer at start up

  Hogwarts 12:53 23 Sep 2012
Locked

I have a Dell Dimension running Windows Vista and it won't boot up properly. Windows tries to start but I end up with a black screen and the pointer but nothing else.

I've tried the Windows DVD that came with the PC but "Startup repair" doesn't work and "System Restore" fails.

I don't want to reinstall Vista as I'm afraid it will wipe the data on the HD and my last backup was some months ago.

Can anyone help please?

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