Hi!
Im using Nokia E51 phone and USB cable connection and face the same problem.
1. Just downloaded and installed latest PC Suite version 7.1.180.46 on Win7 64bit
2. Already "Repaired" the "PC Connectivity Solution" as proposed above
but problem remains. When I connect the phone I can access messages and contacts, but after a while (or sometimes from the beginning) this is not possible anymore, even the phone is still "connected" in PC Suite. Btw. OVI Suite is showing the same problem.
As also the messages are affected; I dont want to try the proposal to delete all my contacts.
Any other ideas?