There's a working application available for download FREE which allows you to execute a script (or set of scripts) against multiple servers. That’s pretty much it!
It's called SQL Multi Script and you can download the alpha version here
it doesn’t require an install and you can get started in about 1 minute.
There are amazon vouchers available for good feedback.
Take a look and post a comment on the forum. It won't take you a moment and it could save you hours!