Open Word
Close the blank document.
Go to File Menu/Open
Browse to C:\Program Files\Microsoft
Office\Templates
Set Files of Type to Document Templates
Open the Template named Normal
Goto Format Menu/Style...
Choose the Normal Style of the left side of
the screen
Click the Modify Button
Click the Format Button and choose Font
Make your font changes (I like Arial 12 point)
Click OK, OK and Apply to get back
to the document
Goto File Menu/Save
Close Word
Re-start Word and you should have the new typestyle