You should not use VISA USB Raw to try to talk to a USB HID device. VISA does not know anything about USB HID. The USB Raw mode is the lowest level USB protocol level, comparable to the IP level in TCP/IP and you don't want to communicate on IP level to implement a higher level protocol like SNMP.
Instead you should try to get drivers for your instrument in form of a DLL and access this DLL. In the worst case you should interface to the Windows HID API, but for that you need to know the actual data format that the HID messages should contain. This is something the device manufacturer has to provide to do, and in many cases they can't or don't want to do that. Also the Windows HID API is absolutely not LabVIEW friendly and writing an intermediate DLL in C/C++ that translates between the Windows HID API and a more friendly LabVIEW interface is definitely advisable.
But a manufacturer really should provide a DLL for his own devices!!!! This you can then fairly easily call from LabVIEW using the Call Library Node.