Boyd - I looked at the thread you mentioned earlier. It's not exactly the same problem, but I think in their attempt to fix one problem, they may have inadvertently created the one we're faced with now. Hard coding the Wow6432 key into the registry path is probably a bad idea. I suspect the NSIS installer is confused as to which registry it's working with (32-bit or 64-bit). Normally you would tell it by using the SetRegView command. My advice would be to go back to the old script. It seemed to work just fine for both Windows XP and Windows 7 64-bit when I tried it. Maybe we should bring -Oz- into the discussion. I think he was the one that made the changes.