01-06-2009, 09:53 AM
Crimson Tide Moderator
Join Date: Oct 2004
Location: North of the moss line
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I would try (for now) to at least load OS 4.5 back to your PC, and try again to reload it.
Error 507 means simply no Operating System was found.
You might also try using the loader.exe method of loading the OS, and keep Desktop Manager closed.