K8055 problems

I am trying to run a home built k8055 on a PC running windows 2000. The module appears to be ok - ld 11 on, and after two flashes ld8 goes out. However, when i run the demo software, the pc blue screens with an error about multiple connection errors. I have tried downloading the updated software, etc. nothing seems to have an effect. Anyone got any advice?

Have you clicked the connect button in the demo app before you clicked anything else?