I agree with NewtonFP, set up textstyles in your template file. Then you don't have to scroll around, but the other fonts are still there in case you need them.
If you really want to get rid of the unused fonts, they are in C:\Program Files\AutoCAD 2009\Fonts. I think you'll need to close AutoCAD first, but then I suggest you MOVE the fonts you don't want to a new folder... you may need them later.