If you want to choose to upgrade from Windows7 or Windows8.1 to install WINDOWS10, then you must be particularly concerned about the loss of personal data for Win7 and Win8.1 systems after the upgrade is installed, can you save them? Now let's take a look at the answers Microsoft has given:
Win8 or Win8.1 upgrades Win10
will be able to retain Windows settings, personal files and most applications;
WINRT or WINRT 8.1 upgrade Win10
Microsoft has informed that the WIN10 Technology Preview will not run on the Windows RT system, so there is no problem with Windows RT upgrade WINDOWS10.
Win7 Upgrade Win10
Upgrading from Windows7 installs WINDOWS10 also preserves Windows settings, personal files, and most applications.
Windows Vista Upgrade Windows10
This cannot retain any data and must be completely installed on the WIN10 system.
Attention matters
Because currently Microsoft offers downloadable WIN10 Technology Preview only in English, Simplified Chinese and Portuguese three languages, so if the current use of the win7/win8/ Win8.1 system language is not one of these three languages, you will only retain your personal files when you upgrade, and you cannot keep Windows settings and applications. Also, the installed language Packs or Language Interface Pack (LIP) in the system are removed when the WIN10 Technology Preview is installed.
