Hi Mike

For what it's worth, I faced the same issue (I can't remember if it was same exact error message but something similar), and was forced to restore the previous version of Purchase Orders.

Actually it's a bit more complicated. They use a 2008 server with Vista for everything BUT PO. They are waiting for PO to work with Vista before disconnecting their 2003 Server. Unfortunately, when I installed the latest PO upgrade, which should have been Vista compatible, it would irregularly fail to launch. Tech support is unable to help at this time because it is too sporadic for them to troubleshoot. I am hoping that others have experienced this. I don't have any other PO users running Vista.

Steve