This is a Vista protection thing. Install Shield should give you an option to say OK, or trust this. Mine does after I've downloaded and saved the file to my desktop, then clicked install.
Posted from my CrackBerry at wapforums.crackberry.com
Go to the forum you want to post the question to, at the top left, there is a button that reads "New Thread". Click that and you're off and running posting your own question.