Dear usermcw,
I had the same issue, and finally found the solution - which is painfully simple once you get it!
Open a new word document
Click on the 'home' tab.
Go to the section 'font' which is in an enclosed box. To the lower right corner of this box is an arrow. Click on the arrow and a pop-up box will appear. Choose your default font eg Times. Then look below at the bottom left corner of this pop-up box: click
'Set as default'. Another pop-up box will appear saying if you want to apply these changes to the current document or all future documents, click on the second option. Then click on ok till you reach your blank document. You can test if this worked by opening
a new document, it should go straight to Times font not Calibri.
The same applies for changing spacing: instead of 'home', now click on 'page layout', go to the box called 'paragraph'. In the lower right hand corner, click on the arrow so a pop-up appears. Choose/write 0 for before- and after- line spacings and click the
'set as default' button which appears below, and follow steps as mentioned.
If my description is hard to follow, you can check out some picture-steps at http://www.addictivetips.com/microsoft-office/change-default-font-settings-styles-in-word-2010/.
Hope this helps!
Cheers.