http://www.inmatrix.com/files/dvdgenie_download.shtml
DVD genie - is supposed to stop programs like power dvd asking for you to change the region code.
And - be carfull with the re-installation thing - it doesn't ALWAYS reset the counter when you reinstall, my dvd rom drive for example is now on 2 changes remaining - and i've just done a full reformat.
SOME drives can have their firmware updated to be region free (Google your drive to see if you can do it to yours)
If you have a dvd writer you could 'back up' you OWN films (of course) with a program like dvd-shrink - which also converts the dvd to region free.