The adcenter desktop client beta doesn’t work on my new x64 windows vista system, and says that the connection/login credentials are incorrect although they work fine on the web interface. Further research shows that it’s a known issue as reported in the adcenter community forums here and changes are planned for the next release.
The application will install on a 64-bit version of Vista, but the real problem that is keeping you from using the application is that adCenter Desktop uses SQL Server Compact Edition as the underlying database which doesn’t have support on an 64-bit operating system. So if you have the 64-bit version installed then you won’t be able to use the application.
Update: Adcenter done some updates to its web UI and adcenter desktop beta on May 14 2009 and the connect problem on Windows x64 mentioned above has now been resolved.