I connect using all three connectivity options on 6255 - IR/BT/DKU-2 and all but IR work like a charm. BT on the widcomm stack and DKU-2 drivers from Nokia. They work flawlessly. Remove all 6255 stuff you installed including PC suite just install DKU-2 drivers and create a new connection. You may or may not need modem init string at+crm=1. it will work.
Happy surfing
WP