Hello
AFAIK Fusion creates a Windows VM to host Converter. The logs should be there (in %ALLUSERSPROFILE%\VMware\VMware vCenter Converter Standalone\logs). May be you should ask in a Fusion forum for more details.
However be aware that Converter does not support Windows 2000 since 4.3 (and by that I mean it can not convert W2K, not that it is just unsupported). I am not sure which exactly Converter version Fusion 7 uses but it should be newer than 5.0.
Regards,
Plamen