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Simplest way of installing W10 (Almost clean install) with activation
Hi there
This method will give IMO the best way of updating your system to W10 via an "Almost" clean install.
1) Re-install CLEAN your old legacy OS -- at boot delete all the Windows partitions so there's NOTHING on the HDD (or Windows "C" partition.
2) Ignore / skip the prompt for Windows 10 is available.
3) let the install finish together with any updates the system finds during the install. DO NOT INSTALL ANYTHING ELSE at this stage.
4) VERY IMPORTANT -- ACTIVATE WINDOWS via entering your product key (of the OLD OS). You might need to use control panel and enter Change product key if you are using say your old MSDN / TechNet keys.
5) now go into Windows update via control panel and you'll be offered the Windows 10 upgrade
download it.
Upgrade
you are now done and activated -- it's as good as a CLEAN install -- plus you'll have the odd driver working that W10 might not find.
If you want REALLY to do a clean install later then there are many ways via ISO etc to do it -- but your OLD OS must be activated first before any W10 upgrade if you want to have an activated product.
Cheers
jimbo.