www.winhelp.us/non-destructive-reinstall-of-windows-7.html

How to reinstall Windows Vista or 7 without losing personal data, installed programs or settings

www.sevenforums.com/tutorials/3413-repair-install.html

This will show you how to do a repair install (aka: in-place upgrade install) to fix your currently installed Windows 7 and preserve your user accounts, data, programs, and system drivers.

windowssecrets.com/top-story/win7s-no-reformat-nondestructiv...

Microsoft won’t tell you this, but you can do a fast, nondestructive, in-place, total reinstall of Windows 7 without damaging your user accounts, data, installed programs, or system drivers.

That means you m ...