Ugh, any reason for the upgrade? My experience has been Activestate's 5.8.0 is not very good, a lot of modules have problems with (DBI/DBD::ODBC especially). I always recommend 5.6.1 on Windows, works great.
As a short term fix, ask them to map .cgi to a perl 5.6.1 binary for just your installation (Goto internet services manager, right click on the directory where gforum is, then setup the application mapping for .cgi to goto perl 5.6.1).
If that's not possible, I'd guess they didn't install extra perl modules like DBI or DBD::mysql with the new version.
Cheers,
Alex
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