Change MS Word default indent from 0.63 to 0.45

In Word (2010 and 2013) is a default indent 0.63 cm (1,27 cm...). I want to know how to change it to 0.45 cm, 0.9 ... Once and for all. The change must be applied to the entire software - not only to a style or a template. And the default tab-grid should be also 0.45 cm. So - what I need is a tutorial or a .reg file that solves the problem once and for all in word 2010 and word 2013. Thank you!