I'm having the same problem.
Im using windows xp SP3 and the HD will not Map Network Drive.
I contacted the support and they were next to useless. I cannot understand why they are not open on the weekends and close at 4.30pm!!
I have tried all the solutions, disabling the 1394 Network Connection, because someone said that would work, it didn't. I have disabled my Anti Virus, I have Kaspersky and even added the software to my trusted site, this didn't work! I have contacted BT regarding my router to disable the Firewall on my router, this again did not work.
I am slowly pulling my hair out.
I am considering sending the unit back. The amount of hours I have spent on trying to resolve this problem is going into days.
If anyone can help...........................