Dell Dock stopped working on my XPS M1530

Hi
I use an XPS M1530 and I am running Vista- Ultimate 64-bit on it.
Last week Dell Dock stopped running and it would just provide me with an error message that it ran into a trouble and has to close. Then I clicked on send error statement and then it tried to restart Dell Dock, then it just it shows me that there was an error presenting the report so try once more, but it just won't perform anything then. Also I've reinstalled but still get the same error. What should I do? Need your help. Thanks a lot.
