Automatically Restarting the Browser

I have an Internet site that needs the user to add our browser extension. However, people do not know they need to restart the browser for it to work and when they eventually do (next day) there attention is not on my product anymore and I lose them. Is there a way for them to click a link on my site (after they sign up) and it will restart the browser for them and automatically bring them back to my site? Any help with this would be greatly appreciated.

Not without any ActiveX scripting which will still require the user to install and interact with its first run.