JavaScript not writing a .txt file

I've been trying without success to get JavaScript code to save a Storyline variable to a .txt file, in a CD-published program. 

I used the exact code given in the Support page at http://www.articulate.com/support/storyline/javascript-best-practices-and-examplesbut it's not writing a txt file. I've looked through the various threads on this but I'm still stuck. It also doesn't work on other Windows machines. Is there perhaps a security setting I need to change which is preventing file creation on the hard drive? If so, it's going to cause user problems later.

My JavaScript code is below, I set the SL variable 'First' to a name:

var fso = new ActiveXObject("Scripting.FileSystemObject");

var s = fso.OpenTextFile("C:\\Test.txt", 8, true, 0);

var name = player.GetVar("First");

s.WriteLine("Name: " + name);

s.WriteLine("==========");

s.Close();

I would appreciate your ideas and help. Does this code write a .txt file in your hard drive root directory?

Many thanks, Tim