WDAC Problems and a solution that worked

I won't bore you with all the details. In short, customer had Vista Business, the communicator program for one of their applications stopped working therefore no updates for the application. Contacted technical support for the application, they analysed it and concluded that the problems was that WDAC had become corrupted. WDAC is not like MDAC, it can not be repaired the same way. By chance I upgraded the .NET framework and the communicator started to work again. hope this helps someone.