Thanks for the reply Jacob
editing Adobe Illustrator Startup_CMYK and Adobe Illustrator Startup_RGB are the steps I have tried, however it seems to revert back to Myriad all over again.....
I do not believe there is a way to this.
I am quite sure it works in CS2.
If it does not in CS, it may be worth having a look at the preference file itself: maybe the default font is still lurking there as in 10. So you may try the hint Working with the AIPrefs/Adobe Illustrator Prefs file as if it were 10.
I should very much like to know which way it works in CS, if any. Hopefully, it is not dropped in the middle between the old way in 10 and the new way in CS2.
Found the following using a general search. Don't know whether it will be helpful.
Before changing the default font in Illustrator CS, you need to create a custom startup file by editing the Normal Character Style in Illustrator's startup files.
To change the default font...
1. Quit Illustrator.
2. In the Adobe Illustrator CS/Plug-ins folder, copy the current default startup file -- Adobe Illustrator Startup_CMYK or Adobe Illustrator Startup_RGB -- and save it with a different name. (This creates a copy of the original startup file in case you need it again.)
3. Open one of the default startup files (Adobe Illustrator Startup_CMYK or Adobe Illustrator Startup_RGB, depending on which type of document you intend to use).
4. Activate the Character Styles palette if it isn't already showing (Window | Type | Character Styles).
5. Select the Normal Character Style and choose Character Style Options from the palette flyout menu.
6. Select Basic Character Formats and choose the desired font from the Font Family dropdown menu.
7. Click OK, and save the new file as Adobe Illustrator Startup _CMYK or Adobe Illustrator Startup_RGB in the Plug-ins folder.
8. Restart Illustrator.
In the future, please identify your computer platform.