Mini Kies does not have a win 7 64 version. I got the last update using my GFs laptop with win xp.
The last update was NOT a GPS fix, and samsung never officially said it was. People just assumed it was. As for Froyo Samsung UK keeps setting and changing dates while Samsung US just states "this year"
I downloaded Kies mini V 1.0.0.10082_8 without difficulty on my Dell laptop running Win 7 64 bit, and it seems to work just fine, including install of the JH7 update a few weeks ago.
I also retained the UK version of Kies v 1.5.3.10083_66 rather than deleting it prior to the installation of Kies mini, and it seems to be working just fine also. I wanted to keep it "just in case".