I think there's a lot of people missing the "can take up to" part before the 20hrs. Given I managed to upgrade a badly borked vista install to 7 in about 3hrs I reckon 20hrs would take some pretty exceptional circumstances.
Gotta say I agree with the clean build guys though. Upgrades never seem to work as well as a fresh build and in my experience upgraded boxes end up fully rebuilt within 3 months of upgrading.
I agree that a nuke and pave is a good way to clean house. Yet, you cannot put a timeline on lost data or reinstalling applications, locating serial numbers, and recreating preferences, downloading all your codecs, unzippers, virtual drive apps, audio and adobe plug-ins, etc... Each takes valuable time to install and configure. I liked the idea of the black edition of XP with all the essential apps installed with the OS.
Microsoft needs to make data migration easier. I couldn't get XP to Windows 7 data migration to work properly and how do you know all that you need until you need it and it's gone. I had good experiences with Windows 7 over Vista.
I question the "restored" portion of this statement: "...if he or she just did a clean install and restored/reinstalled programs."
Problem I have with that is you can't restore a program after a clean install of the OS cause the restore is only going to to restore at the file level not the program's registry entries. If you restore the an entire backup that was backed up with the "System State" (is Vista using the same name?) then you get the entire registry which is one reason for doing a clean install of the OS to clean out the reg - ie: you can't pick one application's reg entries. So that's in the XP world, and there use to be 3rd party products that would backup an apps entire reg but 1) is there something in Vista that allows this? I did not think so... and 2) they did not say anything about using 3rd party backup/restore products.
So, what's the story here... something I'm not aware of which is very possible since I'm skipping Vista going from XP to 7 and therefore don't know Vista
I have a Dell XPS notebook with Intel duo core processor 4GB of RAM 320GB hard drive at 5400 rps. My upgrade to Windows 7 from Vista has been going for 27 hours so far and according to the Installation feedback, it's only 42% complete.
I am in the middle of upgrading to Windows 7 from Vista ultimate. I have a Dell XPS notebook with 4gb RAM, 320gb hard drive 5400rps. My upgrade is currently in hour 27 and its only 42% complete in step 2.