system
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Have you looked for adober.exe?
You probably already know this but its likely a copy of ravmone.exe is present in c:\windows\adober.exe. If this is the reality of your situtation and avast! does not see it then there may be a rootkit hiding the copy rather than the primary file. SDFix should clean it.
Also remember that this is very capable of stealing information so you should be taking steps to protect sensitive data.