I was able to get the wildcard to work on my Windows 7 x64 / CVI 2013 system.
Please try running the example C function located here:
ftp://210.123.36.53/VXIpnp/WinNT/NIvisa/Examples/C/General/FindRsrc.c
and tell me what the output from your console is.
The example calls viFindRsrc with the parameter "?*INSTR", which for me returns the resource ASRL1::INSTR, which is the lone serial port in my computer.
Does manually entering your USB resources serial number cause the program to function as expected?
Nathan Murphy