subversion back end crashed

Hello dev,

We have a real problem with subversion repository here!
All svn commands crash with this message:

"This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information."

"svnadmin recover" doesn't work! it crashes with this message:

"Acquiring exclusive lock on repository db.
Recovery is running, please stand by...svn: Berkeley DB error
svn: Invalid argument"

We're really more than just nervous, it'll require a lot of our time
to get working from our backups... Probably there's a way to fix it up
somehow?

Our configiration:
- WindowsXP(with service pack1)
- subversion 0.30

-- 
Best regards, Pavel                          
http://0x00.ru
mailto:pacha_shevaev@mail.ru
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