Is that IWD V2 or V1 as i couldnt get V1 to run at all without an assertion error.
Icewind Dale 1. Expansion pack and latest patches. And crack for convenience. Vista 32 bit Home Premium. Again, may have been with UAC off.
If every one is sure that the PC's settings are correct then it must be hardware related.
Don't be so sure. This problem is becoming more widespread as more and more people are taking up Vista - and it seems to be happenning almost randomly. I do think it is due to a combination of version of Vista, software installed, drivers and hardware, however the actual component at fault is likely to be Vista. It could be drivers, but I think it's more likely it's Vista. Hopefully SP1 will offer a solution.
I wouldn't be surprised if the networking was nerfed so that they could 'enhance' the stability of it in Longhorn.