If you have multiple user accounts on your system, log-in as an Administrator user(in the screenshot, taken from Control Panel / User accounts, we can see our system has two users, “John” is an Administrator and “Robert” is a Standard user; we will then login as John)
When you launch the setup, make sure you checked “Install for this application for: Anyone who uses this computer (all users)” option when you are asked.
And… There you are!
Now you can send your newsletters from your Windows Vista computer using SendBlaster Bulk Email sender