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You may want to refer to the Wireshark USB capture setup wiki page for possible ideas.
But if that doesn't help you, you might need to invest in a USB hardware capture device, such as the ComProbe USB 2.0 Protocol Analyzer from Frontline Test Equipment (a.k.a., Teledyne LeCroy), or the Beagle USB 12 Protocol Analyzer from TotalPhase.
Disclaimer: I am not affiliated with either Frontline Test Equipment or Total Phase in any way, nor have I personally used either of the products mentioned, and so I can't comment on these products' capabilities. Before purchasing any product, you should conduct your own research to be sure the product will meet your needs.