That is a confirmation box. Check the check box and then hit run or cancel. You want to hit run its even described what to do on the startup page of the installer.
After launching a security message will pop up. The updater is not allowed to write to your hard disk without your permission hence you have to check the box giving it permission to write to your harddrive. If you do that and still have a problem then you need to run as adminstrator or disable the UAC
BTW what that says at the top is that the certificate has been verified. Although I don't speak that language
