Is the VSIG editor working on Windows 7 64 bit?
We haven't tested it yet, but can't think of any reason why it shouldn't. You may need to run it in Administrator mode.
will using a USB to serial cable work on teh H7600
Again, no reason why it shouldn't – the H7600 is expecting RS232 – doesn't care where it comes from. There is a remote possibility that Vsig will not recognize the cable – the solution would be to try a different one.
To conclude – both of these should work – if they don't, we'll have to fix them.