Access might not be necessary. If BusiNav was able to display some results, it means it can talk to the Access file.
You can run BusiNav outside of RR. It doesn't have to be in a skin. Make sure of the following.
1. RR is running and has valid a GPS location.
2. When the "Searching..." popup in BusiNav comes up, don't click anywhere else. Just wait for it to finish.
I'll give you guys a debugging version to see what's going on.