GPG4WIN on Vista64

I installed the packgage on my Windows Vista x64 PRO machine, and most seems to work. The GPGee integration, however, fails all over the place. the best I can get is as if it were not installed at all. Has anyone a clue-stick I can beat it with?

I’m not even getting that far. On a brand-new HP laptop with 64-bit Vista Ultimate, I can install gpg4win and all appears fine. However, whenever I execute either WPT or WPA, I get several general errors in a row, followed by a KeyCache - Internal Error dialog, then it terminates.

I see that the docs for gnupg only mention the 32-bit version of Vista, but quite a few postings in various public forums mention success in running it on the 64-bit version. Any one have any ideas?