http://blogs.msdn.com/johnm/archive/2009/07/02/moving-to-windows-7-rc1-upgrade-or-clean-install.aspxAs the very positive reviews for Windows 7 keep rolling in I’m finding more people wanting to test the waters by moving to Windows RC1 today.&#160; The very first question I get is should I upgrade or should I do a clean install .&#160; Here the officialen-USCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.msdn.com/johnm/archive/2009/07/02/moving-to-windows-7-rc1-upgrade-or-clean-install.aspx#9814782Thu, 02 Jul 2009 22:06:42 GMT91d46819-8472-40ad-a661-2c78acb4018c:9814782Keith Patrick<p>Good reason not to upgrade from Win7 beta to Win7 RC that I discovered the hard way (losing 4 hours) last night: that 2 hour shutdown the beta now does since it's expired does not care if you are in the middle of running the RC installation. I had my machine shut down twice last night when it was 80% done with transferring user settings.</p> <p>It's not an impossible wall, as I was able to reset my clock and install off the network (in case Win7 phones home for the time), but it is still quite inconvenient. FWIW, I'm holding off on a clean installation (first since Win2K) until RTM.</p>