Guest os: xp
host: win 7
I suddenly cannot access one of my virtual machines in virtual box. And I don't remember having deleted one of the files necessary for it to run.

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Delete the VM (but not its hard-disk file, when you're given the option.) Create a new VM and attach the existing hard disk file instead of creating a new HDD, and you should be good to go. | |||
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.xmlconfiguration file may be missing or corrupt. Can you confirm that the file exists, and is accessible from the path shown in the screenshot? – sblair May 31 '10 at 23:20