You need a specific type of Firewire FW400 1394a adapter for transferring DV video. An adapter with the correct Texas Instruments chip is available from
https://www.amazon.com/SIIG-FireWire.../dp/B000G6U8VY. You also need specialized software for making the transfer from DV tape to computer DV-AVI, such as Scenalyzer (
http://www.scenalyzer.com/http://). Note that DV is an obsolete format, support for which has been diminishing for some time now that XP is no longer being sold.
Also note that DV source should be
copied as direct 1:1 transfer via FireWire,
never "captured" (re-encoded) via USB or analog capture cards.