I am experiancing the same issue.
The error was persisting for my bluetooth connection.
I went to trouble of purchasing a cable because i thought it would the easist way to resolve this.
How I'm having exactly the same trouble, and am getting rather peeved. Now I've gone to the trouble of signing up to your forum so I am expecting a response!
My phone is a 6300 and has the latest firmware.
Same problem here with a 3500c on both Vista & XP computers. USB cables (yes I tried two different ones) & computers work fine - can transfer data no problem with the phone set to data transfer mode. But in Nokia mode? Well PC Suite knows the phone is there but you can't do anything with it. I've disabled the firewalls & there's no AV software present on either PC.
The silence on this issue is deafening.
Same issue here too.
THe PC suite sees the phone but can actually do anything with it.
Seems the 3500 has issues as my 5200 works fine with the suite.
Same issue here.
I called nokia support, They made me try *#7370# on my phone to reset, it didn't work.
I'm not overly impressed with the support.
I love nokia phones (had them for 11 years).
I'm lucky, I have a 10 days satisfaction guarantee and I am returning this unit (3500c), and switch to another company.
You should do this too if you can.