I would advise very strongly against that.
Remember: yours isn't the only application on the user's machine, nor likely
the only application they'll be using. Changing their resolution will impact
everything else they're doing at the same time. Some users have their
resolution set due to vision problems: changing it would be unreasonable to
them. I've always felt that developers have a responsibility to live with
the settings their users have chosen: I know I'd quickly scrap your
application if you changed my settings.
Instead, design your application for a reasonable setting (say 800x600) and
consider having it resize itself to fit the user's actual setting. There
have been numerous posts made about ways to do this.
The Access Developer's Handbook (see
http://www.developershandbook.com/) has
sample code in it, or you can download an MDE to use in your application at
http://www.developershandbook.com/downloads.htm
You could also purchase ShrinkerStretcher from
http://www.peterssoftware.com/ss.htm