I notice this camera's ASCOM driver uses 64 bits!!!! Is there a 32 bit version ASCOM driver for this camera? Is it possible that 32 bit driver may be more compatible than 64 bits? 64 bits seem to be an overkill.
Have you tried non-64 bit application driver?:
http://www.gxccd.com/cat?id=154&lang=409
Click on the first link for USB or second link for Ethernet.
I understand that 64 bit driver is for 64 bit operating system but give the first two links a try.
Peter