Thanks for taking the time to post your question in the forum (I moved your question to this forum as it fits better to your type of question )
The installation problem would require us to dig deeper into what is missing. As we talked before, our regular Tech Support would be a better way to address this question.
Sorry to hear you are facing problems using PI OLEDB Provider and ADO capacities of MATLAB. What I would like to do is narrowing down the problem. Are you able to run any test queries on PI OLEDB Provider itself aside from MATLAB? If yes, are you able to get a simple PI tag value into MATLAB using this method? It might be that everything is working in general but your MATLAB code doesn't have sufficient error-trapping provisions leading to the problems you are referring to.
Hope it helps narrowing down the problem and find where it is breaking.