I take it you bought the Pinnacle card while you originally had, Win XP yes?
sounds like it might not be fully compatible. You can check the compatibility over here,
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Sonds to me as if you need to set the program to run in compatibility mode, if these were dsigned for XP or vista ...get my drift. The other thing is you could always set the program to run as administrator. The UAC in Win 7 gives us all headaches, but its better than being insecure
Yeah, silly me I didn't think about win7 being 64 bit.
check this page f against your specific model no for compatibility
Windows 7 Compatibility for us robotics: Drivers, Updates, Downloads
The other thing you can try is to consult any manual in regards to extended commands which might help...
More than likely the error you are seeing is associated to incompatibility between your fax modem and the receiving fax machine. It would help if you can tell us more about the fax/modem you are using to be able to better help you.