- disabling items in MSCONFIG
- run setup.exe as administrator
- ensure that a bunch of services are set to automatic and start them
- disabled all antivirus
- boot into safe mode and run delete both folders that start with $Windows at the root of the C: Drive
- change your locale settings.
- remove all previous files, settings, and applications
- Create a registry key called AllowOSUpgrade to 1
People are also saying to do a clean install of 7 or 8 first, or run chkdsk, which could be the reason that the upgrade then proceeds, if the hard drive errors are correctable!
Hey Apple, will you be giving away OS X version 11 away for free? (Or OS XI or OS 11 or OS 10.11?)