Can not access PostgreSQL 8.8 via ADO

hello,

we had installed 8.2 and used a database via ADO with the connectstring
Driver={PostgreSQL Unicode};Server=localhost;Uid=OfficeTalk;Pwd=OfficeTalk;Database=OfficeTalk"

Now we have installed 8.8 and try to use the database with the same connectstring but get the ADO error 80004005.

We tried different variants but nothing works.

Can anybody help us ?

Thanks for response,
Josef Springer