I just finished discussing this situation with the Firewire developers and here is their recommendation for setting the 1394 Windows driver type when using the 3.5.5 Firewire driver that was included with PowerSDR v2.0.19 RC1.

"Our recommendation for 3.5.5 is to use the legacy 1394 bus driver on Win7. This is primarily due to the extra CPU overhead that we identified in Microsoft's new 1394 bus driver."

Please refer to this KB article for setting the Windows 1394 driver to the legacy version
http://kc.flexradio.com/KnowledgebaseArticle50433.aspx

-Tim
---
W4TME
FlexRadio Systems Internet Systems Admin.
Product Verification Team
Tune In Excitement^(TM)

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