USB-to-GPIO

I have 3 questions ....

1. Does anyone know where there are any 64 bit drivers for this product ? I realize that it was originally designed to support win XP, back in 2005, but this is 2011 and MS doesn't support win XP any longer.
2. The 'USB Adapter Driver.DLL' functions - ReadBlock and WriteBlock - have some optional parameters - Block96 and BlockWorkAround. Does anyone know how these parameters control the behavior of the DLL ? I've tried setting them to TRUE and FALSE without any perceptible operational differences.
3. Finally, while requesting a ReadBlock using pmbus command MFR_ID (0x99), according to a bus analyzer, I'm seeing valid transactions and data BUT the DLL is reporting 'Invalid Response'. Does anyone know WHY this would be happening?

Thanks

Roy