I wasted a lot of time trying to get VirtualDub (a popular video capture utility) to work under Windows XP through a firewire connection. It turns out that VirtualDub utilizes Video for Windows (VfW) drivers which are well supported under Windows 3.1 and 95. However, VfW has been depreciated in favor of the Windows Driver Model (WDM) in more recent Microsoft operating systems.
Most drivers support only VfW (and offer no support for WDM). According to VirtualDub’s author it is very difficult to update VirtualDub to use the new WDM. Consequently, this hasn’t been completed and VirtualDub doesn’t natively support Windows XP. A work around is vaguely mentioned (on Google groups) about a VfW to WDM wrapper. However, this approach appears to be a hack with poor video capture results. Morale of the story, don’t try to use VirtualDub on Windows XP through a firewire connection. (Video capture cards under XP don’t appear to have this problem with VirtualDub.)