remove http from run statement

I need to be able to write my scripts so that i can open several different browsers and on a couple of different operating systems.  I wrote a script using FireFox to navigate to my application.  Works fine on my computer, (Win7, ff 17.0.1) my co-worker has (XP, ff 17.0.0), I am getting a JScript runtime error, that states "According to the specified paramaters, the required browser is Mozilla firefox 86, also some of our environments do not use http, and will not go to the specified page, the url is adding characters



This is the line of code

Browsers.Item(btFireFox).Run("xx:####/xxxxx/");



Any help would be greatly appreciated.